Chicago Format Guide

Chicago Format Guide: How to Cite Sources and Format an Academic Paper

Chicago style is a system for documenting sources and preparing scholarly manuscripts. This guide explains the two Chicago citation systems—Notes and Bibliography and Author-Date—alongside paper layout, footnotes, endnotes, bibliographies, reference lists, quotations, paraphrases, and source-specific examples. It is written for students, researchers, and writers who need to identify the correct Chicago format and apply it consistently.

The name Chicago style usually refers to the rules in The Chicago Manual of Style (CMOS), published by the University of Chicago Press. The manual covers more than citations. It also addresses capitalization, punctuation, numbers, quotations, tables, figures, indexes, editorial practice, and manuscript preparation. In academic assignments, however, the phrase “Chicago format” most often refers to the citation system and document presentation required by an instructor, department, journal, or publisher.

Chicago is not a single in-text citation pattern. It provides two principal documentation systems. Notes and Bibliography uses numbered footnotes or endnotes and usually a bibliography. Author-Date uses parenthetical citations in the text and a corresponding reference list. Both systems identify sources, but they place source information in different locations and serve different disciplinary conventions.

The Notes and Bibliography system is strongly associated with history, literature, art history, religious studies, philosophy, and other humanities disciplines. It allows a writer to document evidence in notes while keeping the main argument readable. Author-Date is common in many social and natural sciences because the publication year is visible beside the author’s name, making the chronology of research easier to follow.

This guide uses the 18th edition of The Chicago Manual of Style as the current reference point where edition-specific guidance matters. Some universities and course materials still prescribe the 17th edition or a locally adapted Turabian format. The edition and institutional instructions should therefore be checked before final formatting. Chicago’s official online Citation Quick Guide provides source examples for both systems.

Chicago citation is a relationship between a claim, the source that supports it, and the reader’s ability to locate that source. A footnote without a traceable publication detail is incomplete. A bibliography containing sources never cited may be inappropriate if the assignment requests a reference list rather than a full bibliography. A correctly formatted paper must therefore connect the chosen system, the source type, the citation location, and the final list of sources.

Choose the Correct Chicago Citation System

The first decision in a Chicago paper is not whether to use a footnote or a parenthetical citation. It is which documentation system the assignment requires. Notes and Bibliography and Author-Date share many conventions for titles, names, publication details, and source identification, but they are not interchangeable within one paper.

Notes and Bibliography: humanities and source-rich research

In Notes and Bibliography, a raised numeral in the text directs the reader to a numbered note. The note may appear at the bottom of the page as a footnote or in a separate endnotes section. A full note normally gives the author, title, publication information, and a page number or other locator. Later references to the same source can use a shortened note. A bibliography usually appears after the main text and lists the sources cited or consulted, according to the assignment’s requirements.

This system works well when a paper needs to discuss archival records, manuscripts, historical editions, interviews, legal or institutional documents, artworks, translations, or several works by the same author. Notes can also contain brief explanatory comments, although they should not become a second essay that distracts from the argument.

Author-Date: research where publication chronology matters

Author-Date places a brief citation in parentheses, normally consisting of the author’s surname and year. A page number is added when referring to a specific passage or quoting directly. The reference list supplies the full publication information. Readers can quickly see which research is being discussed and when it appeared, which is useful in fields where the date of evidence or theory is significant.

How to decide when instructions are unclear

• Look for explicit terms such as “footnotes,” “endnotes,” “Notes and Bibliography,” “author-date,” “parenthetical citations,” “bibliography,” or “references.”
• Review a department’s dissertation or thesis handbook. A university may require a particular Chicago system even when the discipline commonly uses another.
• Check a journal’s submission instructions if preparing an article for publication.
• Review a model paper supplied by the instructor, but do not assume that every formatting detail in an old sample is current.
• Ask the instructor or supervisor if the requirement remains ambiguous. A short clarification can prevent extensive reformatting.

Neither system is inherently more rigorous. The correct choice depends on the assignment and the audience. A history essay may use Notes and Bibliography to distinguish primary documents from later scholarship. A public-health research paper may use Author-Date to make the sequence of empirical studies visible. In both cases, accurate source selection and complete bibliographic information matter more than the visual appearance of the citation.

Chicago Manual of Style and Turabian: What Is the Difference?

Students often encounter the terms Chicago, CMOS, Turabian, and Chicago/Turabian as if they mean exactly the same thing. They are closely related, but they refer to different publications and purposes. Understanding the distinction helps prevent a student from applying a rule from the wrong guide.

The Chicago Manual of Style is a comprehensive editorial and publishing manual from the University of Chicago Press. It is used by publishers, editors, academics, and researchers. It addresses source citations as well as manuscript preparation, grammar, punctuation, capitalization, tables, figures, and other editorial questions.

A Manual for Writers of Research Papers, Theses, and Dissertations, commonly called the Turabian Manual, adapts Chicago guidance for student research papers, theses, and dissertations. It is associated with Kate L. Turabian and is designed to make Chicago conventions practical for academic assignments. Turabian offers the same two broad documentation systems: Notes and Bibliography and Author-Date.

Many universities say “Chicago/Turabian” because their student requirements draw on the Chicago system but use Turabian’s student-focused presentation. A course may prescribe Turabian’s title-page layout or a local template while expecting Chicago-style footnotes. In that situation, the university’s current instructions should guide the paper.

Which guide should you consult?

• Publisher or journal manuscript: consult the edition of the Chicago Manual named in the submission guidelines.
• Undergraduate essay: use the instructor’s preferred Chicago or Turabian guide and any course template.
• Master’s thesis or doctoral dissertation: check the graduate school handbook, department rules, and supervisor’s directions.
• Historical or archival research: use the required Notes and Bibliography approach and check how the institution wants archival collections, manuscripts, and unpublished materials identified.
• Scientific or social-science paper: confirm whether Author-Date is required and whether the department has adapted the reference-list conventions.

Do not combine rules simply because both publications use the Chicago name. For example, the placement of a title page, the handling of headings, or the label for the final source list may be set by a university rather than by a universal rule that applies to every student paper. A style guide establishes conventions; an assignment brief can narrow or modify those conventions for a specific task.

Chicago Paper Format: Margins, Font, Spacing, and Page Numbers

Chicago paper format includes document presentation, but there is no single layout that should be imposed on every assignment without checking the instructions. Student papers commonly use readable 12-point type, one-inch margins, double-spaced main text, paragraph indents, and page numbers. However, the exact font, title-page arrangement, pagination, and spacing of notes or bibliography entries can vary by institution and assignment.

Margins and page layout

A common student-paper setup uses one-inch margins on all sides. This provides space for readable text and instructor comments. Use the word processor’s page-layout settings rather than inserting spaces or repeated tabs to simulate margins. Keep the left and right margins consistent, and avoid shrinking the text or margins simply to reduce the page count unless the assignment explicitly permits it.

Font and type size

Use a legible, accessible typeface and the size specified by the instructor. Many student guides use 12-point Times New Roman, but Chicago does not mean that every paper must use that exact font in every context. A publisher may prescribe a different typeface. A university template may also set the font automatically. Consistency is more important than switching typefaces between the body, notes, headings, and bibliography without a reason.

Line spacing and paragraph indentation

Double spacing is a common requirement for the main text of student papers. Paragraphs are usually indented at the first line rather than separated by extra blank lines. Footnotes, endnotes, block quotations, captions, and bibliography entries may have different spacing instructions. Check the relevant guide instead of applying one spacing command to the entire document without review.

Page numbers

Page-number placement depends on the required student format or publisher style. A title page may be unnumbered or may count as the first page without displaying a number. The main text may begin with page 1 or continue the document’s numbering, depending on the instructions. Use automatic page numbering in the header or footer. Do not type page numbers manually because later edits can make them incorrect.

Paragraphs, headings, and alignment

Use a consistent paragraph style. The body text is normally left-aligned rather than fully justified unless the publisher or institution requests otherwise. Headings should communicate the paper’s structure and should follow a consistent hierarchy. Avoid changing font size, boldness, capitalization, and spacing arbitrarily from one heading to the next.

Before submission, inspect the document in print layout or export it to PDF. A paper can look correct in the editing view but contain an orphaned heading, a blank page, a displaced footnote, or a bibliography that starts immediately after the final paragraph. Review the complete document at normal page size.

Chicago Title Page: Student Paper and Research Manuscript

A title page identifies the paper and its academic context. Many student assignments using Chicago or Turabian require a separate title page, while some instructors ask students to place the title at the top of the first page. Do not create a title page automatically if the assignment says not to include one.

Information commonly included

• Full title of the paper, written in title case when required.
• Subtitle, if it clarifies the scope or argument.
• Student’s full name.
• Course number and course title.
• Instructor’s name, if requested.
• Institution or department, if required.
• Submission date.

In many Turabian student-paper examples, the title is centered and positioned around one-third of the way down the page. The author and course information appear below it, with spacing that gives the page a clear visual hierarchy. This is a common model rather than an unconditional rule for every Chicago manuscript. A journal article, conference paper, or dissertation may require a different title-page arrangement.

Title and subtitle

A useful title identifies the subject and the paper’s focus. A subtitle can narrow the scope by naming a period, place, population, text, or analytical approach. Avoid a title that promises a broader argument than the paper actually develops. For example, “Industrial Change in Britain” is broad; “Industrial Change and Urban Labour in Manchester, 1830–1870” identifies a more specific topic and context.

Title page example

Use the exact course and institution details supplied by your school. Do not add an instructor’s title or department that you have not verified. If the paper is submitted anonymously, follow the required anonymisation process and remove identifying details from the file metadata if instructed.

When the title page is complete, check that the body begins on the correct page and that the first page number follows the required convention. Use a page break rather than pressing Enter repeatedly to force the main text onto a new page.

Chicago Footnotes and Endnotes: Numbering, Placement, and Content

Footnotes and endnotes are central to the Notes and Bibliography system. Both provide source information through numbered notes, but they appear in different places. A footnote is placed at the bottom of the page containing the relevant superscript number. An endnote appears in a notes section, commonly before the bibliography or at another location specified by the assignment.

How note numbers work

Place a superscript Arabic numeral in the main text at the point where the source is being documented. Word-processing software should generate the number and corresponding note automatically. Number notes consecutively through the paper unless the required publication format specifies another approach. Do not type superscript numerals manually because inserting or deleting a note can disrupt the sequence.

The note marker is generally placed at the end of the relevant sentence or clause, normally after punctuation. The note should identify the source supporting the material immediately before it. A citation should not be placed so far from the relevant claim that readers cannot tell which statement it documents.

First full note

The first note for a source generally provides enough information for the reader to identify the work. For a book, this normally includes the author’s name, title, publication details, and page cited. In the 18th edition, book citation models have been streamlined; use the edition-specific example rather than copying older templates that include details no longer required in the same way.

Shortened notes

After the first full note, later citations to the same work generally use a shortened form. A common short note includes the author’s surname, a shortened title, and the relevant page number. The shortened title should remain distinctive when the same author has more than one work in the paper.

Chicago’s 18th edition no longer requires ibid. as the standard way to repeat a citation. Use the appropriate shortened-note form consistently. Some older course materials may show ibid.; if the instructor explicitly requires an older edition, follow that edition’s instructions.

Footnotes versus endnotes

Choose the location required by the assignment. Footnotes allow readers to see source details without leaving the page. Endnotes keep the bottom of each page less crowded, which can be useful in a long manuscript. Do not use both systems randomly in the same paper. If explanatory notes and source notes are both needed, apply one coherent numbering system and follow the prescribed layout.

Explanatory notes

A note can include a short clarification, a translation, a qualification, or a comment that would interrupt the main argument. The explanatory material should remain relevant and concise. If a note becomes several paragraphs long, consider whether the information belongs in the main text or an appendix. Notes should support the argument, not conceal a missing section or carry a second version of the paper.

Use the word processor’s footnote or endnote function. In Microsoft Word, use the References tab; in Google Docs, use Insert and then Footnote. Review numbering, spacing, superscript placement, and note separation after converting the document to PDF.

Chicago Bibliography: Order, Format, and Source Matching

A bibliography is the list of sources cited or consulted in a paper using Notes and Bibliography. It normally appears after the main text and any endnotes, although a department or publisher may specify another order. The heading is commonly “Bibliography.” The list allows readers to identify the works behind the notes and locate them independently.

Bibliography entry structure

For a typical book by one author, the bibliography entry inverts the author’s name: surname first, followed by the given name. The title is italicised. Publication information follows according to the current Chicago model. Entries are alphabetised by the first element, usually the author’s surname. If there is no author, the title or responsible organisation may determine placement.

Compare the entry with the earlier note. The note gives the author’s name in normal order and identifies the page cited. The bibliography entry begins with the surname and normally does not identify the specific page used. A source cited in a note should have a corresponding bibliography entry when the assignment requires a bibliography, subject to the applicable rules for source types and personal communications.

Alphabetical order

Arrange entries alphabetically by the first element of each entry. Follow the current manual’s letter-by-letter ordering conventions rather than sorting by the date of publication. When several works by the same author appear, apply the current Chicago guidance for repeating author names and ordering works. The 18th edition prefers repeating the author’s name rather than using a three-em dash as a substitute in bibliography or reference-list entries.

Hanging indent and spacing

A hanging indent places the first line of an entry at the left margin and indents subsequent lines. It helps readers distinguish one entry from another. Use the paragraph settings in the word processor to create the indent; do not insert spaces manually. The spacing between entries should follow the instructor’s or publisher’s requirements. Many student templates use double spacing, while other Chicago layouts use single-spaced entries with a blank line between them.

Bibliography or selected bibliography?

A full bibliography may include works consulted during research even when they are not cited directly. A selected bibliography contains a chosen subset. If an assignment asks for a “Works Cited” or “References” list, do not relabel it “Bibliography” without checking the required system. Notes and Bibliography usually uses “Bibliography”; Author-Date usually uses “References.”

Checklist for the final source list

• Every source that requires a bibliography entry is represented.
• Author names and titles match the source itself.
• Titles use the correct italics or quotation marks.
• Publication years, publishers, journal details, volume and issue numbers are accurate.
• DOIs and URLs lead to the cited work, not a search result or unrelated landing page.
• Entries are alphabetised and use a consistent hanging indent.
• Unpublished or archival sources are described sufficiently for a reader to identify the collection or item.
• Fictional or placeholder references used during drafting have been replaced with verified source information.

A bibliography is not a place to make a source appear more authoritative than it is. Verify that the cited edition, publisher, journal, report, or web page exists and that it supports the point for which it is cited.

Chicago Author-Date Citations: In-Text References and Reference Lists

Chicago Author-Date uses parenthetical citations in the body of the paper. The basic citation identifies the author’s surname and year of publication. A page number or other locator is added when the writer quotes directly or refers to a specific passage. Each in-text citation should connect to a full reference-list entry.

One author

Two authors

List the authors in the order given by the source. Do not reverse their order simply because one name appears earlier alphabetically. For works with more authors, use the rule in the edition you have been instructed to follow. Chicago 18 revised author-count conventions; avoid copying an older 17th-edition pattern into a paper that must follow the 18th edition.

Multiple works by the same author

If the same author has multiple works in the same year, the year may require letter suffixes such as 2022a and 2022b. The reference list must use the same suffixes so readers can distinguish the sources. Assign the suffixes consistently according to the ordering rules in the required edition and ensure every in-text citation matches the correct entry.

Multiple sources in one parenthesis

When a statement is supported by more than one source, separate the citations according to Chicago’s punctuation conventions and order them in a way that helps the reader. Do not add a long collection of references simply to make a sentence appear well researched. Each cited work should contribute evidence, context, or a relevant scholarly position.

Reference list

The Author-Date reference list provides complete details for sources cited in the text. It is normally headed “References” and alphabetised by author. The first author’s name is inverted in the entry. Use a hanging indent and include the publication information required for the source type.

Check that every in-text citation has a matching reference-list entry and that every reference-list item is cited in the paper unless the assignment explicitly asks for a broader reading list. The Author-Date system is a closed link between parenthetical citations and references; a mismatch makes the source trail incomplete.

Page numbers and locators

Include a page number when quoting or pointing to a specific passage where the locator is available and relevant. For an online source without stable pagination, use a chapter, section, paragraph number, timestamp, or other locator when appropriate and permitted by the source type. Do not invent page numbers for an HTML page or an e-book whose location system changes between devices.

How to Cite Books in Chicago Style

Books are among the most common sources in Chicago-style research. The citation depends on the book’s authorship and publication form: a single-author monograph, a multi-author book, an edited collection, a chapter in an edited book, a translated work, an edition other than the first, or an e-book. Identify the source actually consulted before selecting the model.

Book by one author

In Notes and Bibliography, the first note gives the author, italicised title, publication details, and the page cited. The bibliography entry reverses the author’s name and normally omits the page cited. In Author-Date, the in-text citation uses the author and year, while the reference list provides the full book details.

Book with two or more authors

Keep the authors in the order printed on the title page or official book record. Chicago 18 has updated the number of names displayed in notes and bibliography entries. In general, the 18th edition lists up to six authors in a bibliography or reference list; for more than six, list the first three followed by “et al.” In a note or Author-Date citation, up to two authors are listed; for more than two, list the first author followed by “et al.” Check the official example for the exact case and punctuation.

Edited book

If the entire volume is being cited, identify the editor or editors and the editorial role. If a chapter written by a contributor is the relevant source, cite the chapter author and chapter title, then identify the edited book and editor. Do not cite the book editor as if that person wrote every chapter.

Chapter in an edited collection

For a bibliography entry, the chapter author’s surname comes first, and the chapter title appears in quotation marks. The edited book title is italicised. The 18th edition no longer requires a chapter page range in a bibliography or reference-list entry in the same way older examples often showed; consult the 18th-edition model for the exact source type.

Translated book

Include the translator when the translation is relevant to the work being cited. This matters in literary studies, philosophy, theology, and intellectual history because translation choices can affect terminology and interpretation. Identify the edition actually read; do not cite the original-language publication as if it were the English translation consulted.

Edition other than the first

Include the edition statement when it distinguishes the version used. A revised or expanded edition may have different pagination, chapters, or arguments. When quoting a page, cite the page number in the edition you actually used.

E-books and online books

Cite an e-book in a way that identifies the book and the version consulted. Add a format or platform detail when it is useful or required. For an online book with a DOI or stable URL, include the appropriate identifier. If the electronic version has no stable page numbers, use a chapter or other locator rather than inventing pagination.

Before submitting a book citation, verify the author, title, edition, publisher, and year against the title page or publisher’s record. Retailer listings can be useful for discovery but may omit contributors or display a different edition.

How to Cite a Chapter in an Edited Book

A chapter in an edited book has two distinct contributors: the chapter author and the editor of the collection. The citation should make this relationship visible. Cite the chapter when its argument or evidence is the material used in the paper; cite the entire book when discussing the collection as a whole.

In Notes and Bibliography, a chapter note normally begins with the chapter author’s name and the chapter title in quotation marks. It then identifies the edited volume, editor, publication information, and the page cited. The bibliography entry begins with the chapter author’s surname and includes the same source relationship in a bibliography format.

The example is fictional and demonstrates the sequence only. Replace every element with verified details from the actual chapter and volume. The editor is not the chapter author unless the source credits the same person in both roles. If the chapter has multiple authors, apply the author-count rule for the edition being used.

For Author-Date, the in-text citation identifies the chapter author and year. The reference-list entry identifies the chapter title and the edited book. Use the appropriate page locator for a quotation or a specific passage.

Do not cite only the book editor when a specific chapter contains the evidence. Doing so makes it difficult for the reader to identify the contribution being discussed and may misattribute the argument to the wrong scholar.

How to Cite Journal Articles in Chicago Style

Journal articles are central to literature reviews, empirical research, and scholarly argument. A complete citation normally identifies the article author, article title, journal title, volume, issue, publication year, page range or article identifier, and DOI or URL when applicable. The order and punctuation differ between Notes and Bibliography and Author-Date.

Journal article in Notes and Bibliography

The first note identifies the author, article title in quotation marks, journal title in italics, volume and issue details, year, and page cited. The bibliography entry begins with the author’s surname and generally includes the article’s page range. Use the journal’s official metadata to confirm the volume, issue, year, and page range.

Journal article in Author-Date

The in-text citation gives the author, year, and page when needed. The reference list provides the full article details and DOI or URL. Chicago 18 permits some changes to the treatment of months or seasons in journal article citations; do not add unnecessary publication details simply because an older guide included them.

DOI and URL

A DOI is a persistent identifier for a digital scholarly object. When a DOI is available, use the current DOI presentation recommended by Chicago and the journal. A DOI should resolve to the cited article. If the article has no DOI, a stable URL may be appropriate. Avoid copying a temporary session URL, a library proxy link that only works for one user, or a search-results address.

Online-first articles

Some journal articles are published online before they are assigned to a volume and issue. Cite the publication information available for the version consulted and update the reference if the final issue details become available before submission. Do not invent a volume, issue, or page range for an article that has not received those details.

Multiple authors

List author names according to the current edition’s rules. Chicago 18 revised the number of authors included in notes and bibliography/reference entries. For long author lists, use the 18th-edition instructions rather than older templates. Preserve the author order exactly as published.

For a systematic review or evidence-based paper, verify that the article is the correct study and not a protocol, correction, editorial, conference abstract, or commentary. The source type affects what the citation needs to communicate and how the work should be interpreted.

How to Cite Websites, Online Reports, and Web Pages

Online sources include web pages, organisational reports, blog posts, online news articles, policy documents, digital archives, and content published on institutional websites. A web citation should identify the responsible author or organisation, the specific page or document, the website or publisher, a publication or revision date when available, and a URL or DOI where appropriate.

Web page with a named author

When a web page identifies an individual author, use that person’s name as the author. The page title appears in quotation marks, and the website name is identified. Include a publication or revision date when available. If no date is provided, an access date may be appropriate under Chicago’s guidance for the source type.

Organisation as author

If an organisation is responsible for the content and no individual author is named, the organisation may be treated as the author. This is common for government departments, universities, museums, research institutes, and professional associations. Use the name shown by the organisation, not an invented personal author.

Undated web pages

If a publication or revision date is unavailable, follow the current Chicago guidance for access dates and web sources. An access date records when the writer consulted the page. It does not mean the page was published on that date. Keep the distinction clear in the citation.

Online reports and PDFs

A downloadable report is usually cited as a report, not as a generic web page. Identify the report title, authoring organisation, report number if relevant, publication date, and URL. If the report is issued by a government agency or research organisation, verify the institutional author and series details on the report itself.

Blogs and online commentary

Identify the post author, post title, blog or website name, date, and URL. A blog post may be useful for documenting a public statement or current discussion, but it should not automatically replace peer-reviewed research or official data when the paper requires scholarly evidence.

Social media posts

When a social media post is genuinely relevant, identify the account or author, the text or description of the post, the platform, date, and a stable link when available. Consider whether the post is likely to remain accessible. A screenshot may preserve content for analysis, but it does not remove the need to identify the account and date accurately.

For web sources, the citation must support the specific claim. If a page has changed since it was consulted, use an archived version when appropriate and explain the date or version if that distinction matters. Do not cite a homepage when the evidence appears on a specific report or subpage.

How to Cite Newspapers, Magazines, and News Articles

Newspaper and magazine citations identify the author, article title, publication name, date, and page or URL where applicable. A print newspaper article may have a page number and edition details. An online article may have a publication or update date and a URL. The citation should make the publication and the specific article distinguishable.

In Notes and Bibliography, a newspaper or magazine article may sometimes be cited in the text without a formal bibliography entry, depending on the context and assignment. When a formal citation is required, use the source-specific Chicago model. An online article should not be treated as a journal article simply because it discusses research.

News article by a named journalist

For a newspaper website, distinguish the article’s publication date from an update date if both are shown and relevant. If the article is undated or continuously updated, follow the source-specific guidance and record the access date when required.

Magazine article

Include the author, article title, magazine title, publication date, and page range for print or URL for online. Some magazines publish web articles with no stable pagination. Do not manufacture page numbers based on a PDF viewer or browser display.

Editorials and unsigned articles

If no individual author is named, determine whether the article is attributed to the publication or an editorial board. Use the publication or title as the entry point according to Chicago’s rules. Do not assign the editor-in-chief as author unless the source credits that person.

News sources can provide contemporary reporting, public statements, and timelines. For claims about scientific effectiveness, historical interpretation, or population-level trends, check whether the news report points to original evidence and cite the original study or report where appropriate.

How to Cite E-Books, Online Databases, and Digital Archives

Digital research materials can be delivered through publisher platforms, library databases, institutional repositories, and archives. The citation should identify the underlying work and provide a stable path to the version consulted. The platform is not always the publisher, and a library access link is not necessarily a permanent identifier.

E-books

Cite an e-book using the book’s bibliographic details and add an electronic format or identifier when useful or required. If a stable page number is available, it may be used as a locator. If pagination changes between devices, cite a chapter, section, or another stable locator. Avoid using an e-reader’s temporary screen number as if it were a printed page number.

Library database articles

When a journal article has a DOI, use it rather than a database session link. If no DOI is available, use a stable URL when appropriate. Some institutional databases provide records that are accessible only after authentication. In those cases, follow the Chicago guidance for the source type and the library’s citation recommendations.

Digital archives and primary sources

Historical research often uses digitised letters, photographs, maps, government records, newspapers, manuscripts, and oral-history collections. A useful citation identifies the creator, item title or description, date, collection, repository, and stable identifier or URL where available. The citation should preserve the chain between the item and the archive that holds it.

When a digitised source is part of a larger collection, cite both the individual item and the collection context. A reader should be able to distinguish a letter from the collection in which it is stored. Include box, folder, item, series, or accession information when the archive provides it and when it is needed to retrieve the source.

Online exhibits and museum collections

For an artwork or museum object, identify the artist or maker, title or object description, date, medium where relevant, holding institution, collection, accession number if available, and online record. Chicago 18 clarifies that museum accession numbers should be included for artworks when available. The accession number is often more reliable than a general page title for identifying an object.

Do not treat a search-engine image result as the source. Open the museum, archive, or collection record and verify the object’s metadata. If the image is reproduced in a book or article, cite the source actually used and follow any rights or attribution instructions.

How to Cite Interviews, Personal Communications, and Lectures

Interviews, personal communications, lectures, conference presentations, and oral histories require enough detail for readers to understand what occurred and, where possible, locate a record. The citation format depends on whether the material is publicly available, recorded, transcribed, privately communicated, or part of an institutional collection.

Published interview

If an interview is published in a newspaper, magazine, journal, podcast transcript, or book, cite the publication in which it appears. Identify the interviewer and interviewee according to the source’s presentation, along with the title, publication, date, and relevant locator.

Unpublished interview

For an interview conducted by the researcher, record the interviewee’s name or approved pseudonym, the interviewer, the date, the method or location when relevant, and any restrictions on disclosure. Follow ethics approval, consent, and confidentiality requirements. Do not expose a participant’s identity when the research protocol requires anonymity.

Personal communication

Private emails, text messages, and conversations are often cited in notes or described in the text rather than included in a public bibliography, because readers cannot retrieve them. Follow the current Chicago model and the assignment’s requirements. Preserve evidence of consent and do not reproduce private content beyond the scope authorised by the participant.

Lecture and conference presentation

Identify the speaker, presentation title, event or course, sponsoring organisation, location or platform, and date. Chicago 18 has clarified aspects of citing presentations; use its current examples rather than relying on a pre-18th-edition template that encloses all presentation details in parentheses.

For research involving human participants, citation accuracy is only one requirement. Protect confidentiality, use pseudonyms consistently, follow the approved research protocol, and ensure that the citation does not reveal information that the participant agreed to keep private.

How to Cite Theses, Dissertations, and Student Research

Theses and dissertations are academic works that may be available through a university repository, ProQuest, an institutional archive, or a department. The citation should identify the author, title, degree or document type, institution, year, and repository or URL when relevant. A dissertation is not automatically a book, even when it is available as a PDF.

Distinguish a published dissertation from an unpublished thesis held by a university. If the work has a database record or repository identifier, include it according to Chicago’s model. If the title page gives a degree and institution, use the information shown there. Do not infer the degree level from the author’s current biography.

When a dissertation is used as a source in a literature review, assess its relevance and scholarly status. A doctoral dissertation may contain substantial original research, but its review process and publication context differ from a peer-reviewed journal article. Explain its role accurately and do not present it as a journal publication.

Students preparing their own theses should also check their graduate school’s formatting handbook. The institution may specify front matter, abstract placement, chapter numbering, margins, line spacing, figure lists, appendices, and the order of notes and bibliography. Chicago citations can be used within a document whose overall thesis layout is controlled by a university template.

How to Cite Government Publications, Laws, and Reports

Government publications include legislation, regulations, court decisions, census reports, statistical releases, policy papers, committee reports, and agency guidance. The responsible body, document title, jurisdiction, publication or enactment date, report number, and official URL may all be important. The correct citation depends on the source type and the legal or academic context.

Government report

Identify the agency or department responsible for the report, the report title, any report number, publication date, and URL. If the report has named authors, determine whether the authors or the issuing agency should lead the citation. Use the title page or official government catalogue rather than assuming the web page’s owner is the author.

Legislation and regulations

Legal citation conventions can be jurisdiction-specific. A paper that discusses statutes, regulations, or court cases may need to follow a legal citation system such as the Bluebook or a local legal citation guide rather than applying a generic Chicago model. Check the assignment and law faculty requirements. Chicago can be used for surrounding scholarly sources while legal authorities follow the prescribed legal format.

Statistical releases and datasets

Identify the agency, dataset or release title, date, version, table number, and access route. For frequently updated datasets, include the date accessed or version when needed to make the evidence reproducible. If a statistic is drawn from a table, cite the exact table or series rather than the general agency homepage.

Policy papers and white papers

These documents may be published by government departments, think tanks, international organisations, professional associations, or private companies. Distinguish the issuing organisation from the author and identify the document type where relevant. Check whether the report has a series number or stable identifier.

Government sources can be authoritative for official policy, law, administrative data, and institutional statements. They are not automatically neutral on every interpretive question. A critical paper should distinguish the document’s official status from the quality, scope, and limitations of its evidence.

Chicago Quotations, Paraphrasing, and Page References

Chicago citation is not limited to direct quotations. A writer must document borrowed ideas, paraphrases, summaries, distinctive facts, and other material that is not common knowledge. The purpose is to show where evidence came from and to distinguish the writer’s analysis from the source’s contribution.

Direct quotations

Use quotation marks for a short quotation incorporated into a paragraph. Preserve the source’s wording accurately. A note or parenthetical citation should identify the relevant page or other locator when available. If you alter a quotation, use the appropriate brackets or ellipses and ensure the change does not distort the author’s meaning.

Long quotations may be set as block quotations according to Chicago’s rules and the assignment’s format. A block quotation is visually separated from the main text, usually indented, and does not use quotation marks around the entire passage. The precise length threshold and layout should follow the edition and institutional guide being used.

Paraphrasing

A paraphrase restates a source’s idea in the writer’s own sentence structure and wording. It still requires a citation. Changing a few words, rearranging a sentence, or replacing terms with synonyms is not a sufficient paraphrase. Read the source, understand the point, put the source aside, and explain the idea accurately in a new structure. Then compare the paraphrase with the original to check that the meaning has not changed.

Summaries

A summary condenses a larger argument, chapter, article, or report. Cite the source that is being summarised. If the summary draws on several studies, make the relationship between each claim and its supporting sources clear. Avoid attaching one citation to a long paragraph if the paragraph contains multiple claims from different works.

Page numbers and other locators

Use page numbers for quotations and specific passages when the source has stable pagination. For web pages, e-books, audio, video, and archival materials, use a locator that makes sense for the medium: chapter, section heading, paragraph number, timestamp, collection identifier, or item number. The locator should help a reader find the material without pretending that every digital source has conventional pages.

Quotation accuracy

• Check the wording against the source, not against a secondary quotation.
• Preserve spelling and punctuation unless an authorised change is indicated.
• Use ellipses only when text has been omitted and the omission does not misrepresent the source.
• Use brackets to clarify a pronoun or make a necessary grammatical adjustment.
• Do not quote a source that you have not consulted unless the citation clearly identifies the secondary source through which it was encountered.
• Include the page or locator required by the selected Chicago system.

Good source use requires both attribution and analysis. A quotation should have a purpose: it may provide a definition, show a scholar’s wording, document a historical statement, or provide evidence for interpretation. Follow the quotation with explanation that connects it to the paper’s claim.

Chicago Tables, Figures, Images, and Captions

Tables and figures present information that may be difficult to communicate efficiently in prose. Chicago provides guidance for captions, numbering, source notes, and placement, but the final layout may depend on the instructor, publisher, or dissertation template. A table usually presents information in rows and columns; a figure may include a photograph, map, chart, diagram, drawing, or other visual object.

Numbering and references in the text

Number tables and figures consistently and refer to them by number in the text. A reader should understand why the visual is included and what it demonstrates. Do not insert a figure without discussing its relevance. If a paper contains multiple types of visual material, use the naming and numbering convention specified by the assignment.

Captions and source notes

A caption identifies the content of the table or figure. A source note identifies where the data or image came from when it is not original. If the visual is adapted, explain the adaptation and cite the source. If the writer created the table from several sources, identify the underlying data and explain the method of compilation when necessary.

Tables

Use clear column headings, units, labels, and notes. Avoid decorative formatting that makes comparison difficult. If a table reports statistical results, explain abbreviations and symbols in a note. Make sure the prose does not simply repeat every value in the table; it should identify the pattern that matters for the argument.

Figures and images

For photographs, maps, artworks, and diagrams, identify the creator, date, title or description, holding institution, and source as required. For museum objects, include accession numbers when available. Check copyright and licensing conditions before reproducing an image. A citation acknowledges the source but does not itself grant permission to reproduce protected material.

Data visualisation

For a chart or graph, identify the data source, time period, population, units, and any transformations. A figure can mislead if the axis begins at a misleading value, the denominator is unclear, or the sample is not described. A well-formatted caption does not correct a poorly designed visual. Explain important limitations in the surrounding text or note.

When preparing a manuscript for publication, follow the publisher’s instructions about whether tables and figures should be embedded in the text or supplied separately. For student assignments, the instructor’s directions take precedence.

Chicago Headings, Capitalization, Numbers, and Punctuation

Chicago style includes editorial conventions that affect how a paper reads. Headings, capitalization, numbers, abbreviations, punctuation, and titles should be handled consistently. The correct treatment can depend on whether a word appears in a title, a heading, a quotation, a technical expression, or the body text.

Heading hierarchy

Use headings to show the structure of the argument. A main section heading should be visually distinct from a subsection heading, and a lower-level heading should not look more important than the section above it. Keep the same formatting for headings at the same level. Avoid creating a heading for every short paragraph.

Chicago offers flexibility in heading presentation, particularly across books and manuscripts. A student assignment may have a local heading style. Use the required format and apply it consistently. If the paper is short, a clear sequence of paragraphs may be more effective than a dense hierarchy of headings.

Title case and sentence case

Chicago generally uses headline-style capitalization for many titles in English, but not every title-like element follows the same rule. Titles of books and periodicals are italicised; titles of articles, chapters, and shorter works are normally placed in quotation marks. Foreign-language titles may follow different capitalization conventions. Do not apply English title case mechanically to every language.

Numbers

Chicago has conventions for spelling out and using numerals, but the appropriate choice can depend on context. Scientific and statistical writing often uses numerals for measurements, data, and technical quantities. Historical prose may use spelled-out numbers in ordinary narrative. Dates, percentages, ages, units, ranges, and large numbers have more specific conventions. Follow the current manual and any discipline-specific instructions.

Abbreviations

Define an abbreviation when it first appears if readers may not recognise it. Use the abbreviation consistently thereafter. Do not create an abbreviation that appears only once or twice unless it materially improves readability. Institutional names and technical terms may have established short forms; verify them from an authoritative source.

Italics and quotation marks

Italicise titles of standalone works such as books, journals, films, and many other independent publications. Use quotation marks for shorter works such as articles, chapters, and individual web pages. The treatment of series, websites, poems, and other source types can require more specific guidance. Avoid mixing italics and quotation marks without checking the relevant example.

Hyphens, en dashes, and em dashes

Hyphens join words or word elements; en dashes are commonly used for ranges; em dashes mark breaks in a sentence. Word processors may automatically replace typed characters, but automatic substitution does not guarantee correct use. Check date ranges, page ranges, compound modifiers, and parenthetical interruptions carefully.

Primary Sources, Secondary Sources, and Citing Sources You Have Not Read

Chicago citations help readers distinguish original evidence from later interpretation. A primary source is created by a participant, witness, institution, or creator connected to the event or subject being studied. A secondary source analyses, interprets, or contextualises evidence. The distinction depends on the research question and the role the source plays, not simply on the age or format of the document.

A diary may be a primary source for the writer’s experience but a secondary source for a later historian’s interpretation of the period. A government report may be primary evidence for an official policy position and secondary evidence for a historical event it describes. A newspaper can be primary evidence for public discourse at the time and secondary reporting about a scientific study. Explain the source’s role in relation to the claim.

When you consult the original source

Cite the original source and identify the version, collection, or edition consulted. If a historical document appears in a published collection, cite the document and the collection details needed to retrieve it. If the archive provides a digital record, include the repository and identifier.

When you have not consulted the original

Do not cite an original work as if you read it when you encountered it only through another author. If the original cannot be accessed and the secondary source is the route through which you know it, make the secondary-source relationship clear using the relevant Chicago convention. Prefer consulting the original whenever practical, especially when wording or context matters.

Source quality and fit

A source can be accurately cited and still be unsuitable for a particular claim. A peer-reviewed study may be relevant to an empirical question but not necessarily to a legal interpretation. A government webpage may be authoritative for current policy but not independent evidence of policy effectiveness. A memoir may illuminate personal experience but cannot alone establish population-wide patterns.

Assess author expertise, publication context, evidence, method, date, limitations, and relevance. Citation formatting does not replace critical evaluation. The paper should explain why a source is credible for the question being asked and what its limitations are.

Common Chicago Style Mistakes and How to Correct Them

Many Chicago formatting errors arise because writers apply a citation rule without first identifying the system, source type, or required edition. A reliable review checks the paper’s overall structure and the details of every source rather than correcting punctuation alone.

Additional errors to check

• Using a page number that belongs to a different edition of a book.
• Leaving a note number out of sequence after editing.
• Placing a note marker beside a sentence that it does not support.
• Using a shortened note before providing the first full citation.
• Listing sources in the bibliography that were never consulted or that cannot be verified.
• Using “References” for a Notes and Bibliography paper when the required heading is “Bibliography,” or vice versa.
• Failing to identify a translated edition, editor, volume, issue, report number, or archival collection when it is needed.
• Copying citations from a search engine or citation generator without checking the source metadata.
• Using quotation marks around a paraphrase or paraphrasing too closely to the original wording.
• Relying on an access date as if it were the publication date.

A useful final check is to choose several citations at random and trace them from the text to the note or parenthetical citation, then to the full bibliography or reference-list entry, and finally to the original source. If that path is complete and accurate for every source, the paper’s documentation is more likely to be reliable.

A Step-by-Step Workflow for Formatting a Chicago Paper

Applying Chicago style is easier when citation decisions are made during research rather than at the end of drafting. The following workflow reduces missing metadata, duplicate entries, and last-minute changes to the source list.

1. Read the assignment. Identify the required system, edition, paper length, title-page requirements, heading rules, and source expectations.
2. Set up the document. Apply the required margins, font, spacing, paragraph style, page numbering, and heading hierarchy before writing.
3. Choose a reference manager or tracking method. Record author names, title, publication details, DOI, URL, access date where relevant, and page locators while researching.
4. Capture complete source metadata. Check the source itself rather than relying on search snippets or incomplete database exports.
5. Insert citations as you draft. Use Word or Google Docs footnote tools for Notes and Bibliography, or a consistent author-date approach for parenthetical citations.
6. Keep quotations and paraphrases distinct. Mark direct quotations in your notes and record the page number at the time you take the material.
7. Build the final bibliography or reference list. Generate or arrange entries according to the selected system and the required edition.
8. Run a citation audit. Match every in-text citation or note to the relevant full entry.
9. Review visual layout. Check page breaks, headings, footnote placement, table captions, figure notes, and source-list spacing.
10. Export and inspect. Open the final PDF and verify that the formatting has not changed during conversion.

Using citation generators responsibly

Citation generators can save time when they import accurate metadata, but their output is not proof of correctness. They may misidentify the author, use a database rather than the publisher, omit editors, format titles incorrectly, or apply an older edition. Treat generated citations as drafts. Verify every element against the actual work and the current Chicago example.

Using reference-management software

Tools such as Zotero, EndNote, and Mendeley can store source records and produce bibliographies. Choose the Chicago style file that matches the required edition and system. Some software offers multiple Chicago output styles, including Notes and Bibliography and Author-Date. A style file may not perfectly reflect every 18th-edition change immediately after publication, so inspect complex cases manually.

When a citation looks unusual, compare it with the official Chicago quick guide or the relevant chapter in the manual. Do not change a correct citation merely because an automated checker flags it as different from APA or MLA.

Chicago Style Across History, Literature, Arts, and Social Sciences

Chicago is used across several disciplines, but the source types and citation decisions vary. The same citation format may need to identify a historical archive, a literary edition, a museum object, an ethnographic interview, or an empirical journal article. The research context determines which source details matter most.

History

Historical papers often use Notes and Bibliography because they draw on primary and secondary sources, archival records, editions, maps, newspapers, government documents, and historiography. A strong note identifies the document and the repository or published collection. The argument should distinguish contemporary evidence from later interpretation and should explain the limitations of the record.

Literature and language studies

Literary analysis may cite novels, poems, plays, translations, critical editions, scholarly chapters, and archival manuscripts. The edition matters because line and page numbering can differ. When citing a poem or play, use the locator appropriate to the work—such as act, scene, line, canto, or page—according to the required convention. Identify the translator or editor when that contribution affects the text being analysed.

Art history and visual culture

Art-history research may cite artworks, catalogues, museum collection records, exhibition catalogues, photographs, and conservation reports. Identify the creator, title, date, medium, collection, and accession number when available. Distinguish the artwork from the photograph or reproduction used to study it.

Religious studies and theology

Research may cite sacred texts, translations, commentaries, manuscripts, historical editions, and contemporary scholarship. Identify the translation or edition used. A reference to a passage in a sacred text may follow conventions specific to the tradition or institution. Check whether the assignment requires Chicago, a discipline-specific biblical citation system, or both.

Social sciences

Author-Date is common in many social-science contexts because it makes publication dates visible. Research papers may cite peer-reviewed studies, datasets, government reports, interviews, and policy documents. The writer should ensure that the source supports the variable, population, and time period discussed.

Natural and applied sciences

Some scientific disciplines use other citation systems, but Chicago Author-Date may be required in interdisciplinary work. Verify the assignment before applying it. Scientific writing also needs accurate reporting of methods, units, data, and version information. A citation should identify the original research or dataset, not simply a review that mentions it.

Chicago is a documentation framework, not a substitute for disciplinary method. A properly formatted citation cannot repair an unsupported historical inference, an inaccurate scientific statement, or a misreading of a literary text.

Chicago Citations and Academic Integrity

Accurate citations are part of academic integrity because they show which ideas, words, data, and interpretations came from other people. A citation allows readers to verify evidence, recognise intellectual contributions, and distinguish original analysis from borrowed material.

Plagiarism can involve copying without quotation marks, paraphrasing too closely, using another person’s argument without attribution, reusing work without permission, or presenting generated or outsourced material as original work in violation of institutional rules. The exact policy depends on the institution, course, and assessment. Correct Chicago punctuation alone does not make unattributed material acceptable.

Keep research notes traceable

When taking notes, record the full source details and the page or locator immediately. Mark direct quotations clearly so they are not accidentally reused as paraphrases. Separate your own comments from the author’s words. If you copy a passage into a draft, retain quotation marks and a temporary citation until the passage is revised or removed.

Paraphrase with understanding

Read the source carefully, identify its central idea, and explain that idea in your own structure. Then compare your version with the original. A good paraphrase preserves the author’s meaning without copying the sentence architecture. Cite the source even when every word is your own.

Use AI and editing tools within institutional rules

Institutions differ in their rules for generative AI, automated editing, translation, and external assistance. Follow the policy that applies to the assignment. Do not use a tool to invent sources, fabricate page numbers, create quotations, or misrepresent who performed the research. Verify every citation against the real source.

Protect confidential information

When citing interviews, clinical materials, workplace records, or unpublished research, follow consent and confidentiality requirements. Do not include names, identifiers, or private details when the research protocol requires them to be withheld. A citation should support transparency without exposing protected information.

For more guidance, review the institution’s academic integrity and plagiarism policy. If you need help checking an existing draft, keep the author responsible for the research, interpretation, source verification, and final submission.

Chicago Citation Audit: A Final Submission Checklist

Use this checklist after the paper is drafted and before it is submitted. A final review should consider the whole document and the accuracy of the evidence, not only whether the citations appear to follow a visual template.

System and edition

• Have you confirmed Notes and Bibliography or Author-Date?
• Have you confirmed whether the assignment requires CMOS 18, CMOS 17, Turabian, or a local adaptation?
• Have you followed the instructor’s directions where they differ from a general example?

In-text documentation

• Does every quotation have a citation and a correct locator?
• Are paraphrases and summaries attributed?
• Do footnote numbers appear in the correct order?
• Are first notes complete and later notes shortened consistently?
• Are author-date citations formatted consistently and matched to the correct year?

Bibliography or references

• Does every required citation have a corresponding full entry?
• Are author names, titles, dates, publishers, journal details, and identifiers accurate?
• Are entries alphabetised correctly?
• Are titles italicised or placed in quotation marks according to source type?
• Are DOI and URL links stable and functional?
• Are hanging indents and spacing consistent?

Paper presentation

• Are margins, font, line spacing, and paragraph indents correct?
• Does the title page follow the required template?
• Are page numbers placed and started correctly?
• Are headings consistent and logically nested?
• Are tables, figures, captions, and source notes identified?
• Are page breaks clean, with no accidental blank pages or isolated headings?

Source integrity

• Have you opened and checked every source rather than relying on a generated citation?
• Have you removed placeholder citations and fictional examples from the submitted paper?
• Do sources genuinely support the claims attached to them?
• Have you followed rules for AI, editing, collaboration, and disclosure?

Finally, save the editable document and the submitted PDF using clear filenames. Keep a copy of the source list and any research notes needed to verify citations later. If the instructor requests a revision, the original metadata and document structure will make corrections easier.

When to Seek Help With Chicago Formatting

Chicago formatting becomes demanding when a paper contains many source types, multiple editions, archival records, translated texts, figures, tables, and extensive footnotes. Support is most useful when it helps the writer understand the rules and correct the document while preserving the writer’s ownership of the research and argument.

A focused review may identify inconsistent note formatting, missing bibliography entries, incorrect title treatment, outdated edition rules, broken DOI links, or a mismatch between the source and the claim. A writer may also need help setting up Word styles, automatic footnotes, section breaks, page numbering, hanging indents, or a reference manager.

For general citation questions, begin with the site’s citation and referencing guide. For help improving an existing draft’s clarity and presentation, see proofreading and editing support. If the citation issue is part of a broader research paper, the research paper support page provides related guidance.

Writers working in history may also need subject-specific guidance through history academic support. Nursing and health-science students should check the citation style required by their course rather than assuming Chicago is accepted; see nursing assignment support for related academic guidance.

Any assistance should remain consistent with the institution’s academic-integrity rules. A reviewer can explain formatting, identify inconsistencies, and provide feedback on the writer’s own draft. The student or researcher must verify the sources, approve every change, and submit work they understand and are permitted to use.