Turabian Citation Guide for Theses and Dissertations

Last fall we got an email from a PhD candidate in religious studies asking this question: What is the difference between Turabian and Chicago remains an open question. We explained that almost every American humanities thesis writer has to figure out that one day. Her program's thesis handbook says "Turabian." Her supervisor says "Chicago." A senior committee member tells her "use whichever, they're the same." She reads both and notes the differences. We've to tell her that her committee member is wrong, her handbook is right, and that the differences are little enough that she can fix them in a week but real enough that her external examiner will notice.

This is the Turabian story. Turabian is Chicago; it follows the same logic and the same two-system structure. Turabian isn't Chicago; it is a different manual written with student writers in mind. In 1937, the dissertation secretary at the University of Chicago, Kate L. Turabian, wrote the first edition of Turabian to help graduate students learn how to use Chicago's rules in their own work. The 9th edition, released in 2018, is the one that most graduate programs cite today.

This Turabian citation guide is the version we wish every thesis and dissertation writer had open while drafting. It covers what Turabian actually is (and is not), the choice between Notes-Bibliography and Author-Date, the templates that differ in little but consequential ways from full Chicago, the rules for citing ChatGPT, Claude, Gemini, and DeepSeek under the current University of Chicago Press guidance, the seven Turabian mistakes our editors catch most often, and the tools that handle Turabian properly rather than approximating it through Chicago.

What's different about Turabian (and why it's the manual for student work)

Turabian's "A Manual for Writers of Research Papers, Theses, and Dissertations" is published by the University of Chicago Press, the same publisher as the Chicago Manual of Style. The two manuals are sibling publications maintained in parallel. The Chicago Manual of Style targets publishers, editors, and authors preparing work for commercial or academic publication. Turabian targets students preparing theses, dissertations, and research papers for academic submission.

The differences that matter most to a thesis writer:

Most writers will take away from this section only the following headline finding: If your program requests Turabian, then yes, you can mostly use Chicago references and pass review. Patterns of footnotes and bibliographies are primarily interchangeable. Where Turabian does excel is in the formatting of theses, rules about the front matter, and the student-oriented sections on research and writing process. These are the pieces of Turabian that do not have an equivalent in Chicago.

If you are using Zotero, Mendeley, EndNote, or Paperpile, you can select "Chicago 17th Edition (Notes & Bibliography)" or "Turabian 9th Edition (Notes-Bibliography)" interchangeably for the citation output. Several reference managers don't ship a distinct Turabian style. Most Turabian submissions accept the Chicago NB style. Note that your title page, margins, and level of heading styles all have specific Turabian requirements.

Notes-Bibliography vs Author-Date in Turabian

Turabian, like Chicago, offers two complete citation systems under one manual. Your decision is driven by your field and your committee, not by your preferences.

Notes-Bibliography (NB) uses superscript numbers in the text, footnotes or endnotes for citation details, and a separate bibliography at the end. It's the standard in history, philosophy, theology, classics, art history, literature, and most humanities subfields at American universities. If your dissertation is a humanities dissertation, NB is almost certainly what your committee expects.

Author-Date (AD) It uses parenthetical (Smith 2023, 47) citations in the text and a reference list at the end. It's the standard in the natural sciences, social sciences, and some interdisciplinary humanities work. AD might be expected if one's dissertation is in psychology, economics, education, or a science-adjacent humanities field; check one's handbook.

Once one begins, one must stick with it. The most common Turabian mistake we see is when authors mix NB and AD in the same thesis. This often happens because they've seen one example in the handbook and another example in a sample dissertation. Choose the system one's discipline uses, confirm with one's committee, and stick with it from the title page to the bibliography.

Turabian Notes-Bibliography: footnotes, shortened notes, and bibliography

Notes-Bibliography includes superscript numbers in the text that refer to footnotes or endnotes. The first citation of a source has a full note with all of its bibliographic information. After the first time a source appears, use a shortened note for next citations. The bibliography at the end of the thesis lists every source cited, alphabetized by author last name.

The templates below cover the source types most common in thesis and dissertation work.

Full note for a journal article:

1. First Last, "Title of the Article in Title Case," Title of
   the Journal in Italics 45, no. 2 (2023): 147,
   https://doi.org/10.xxxx/xxxx.

Shortened note for the same source:

5. Last, "Shortened Title," 150.

Bibliography entry for the same article:

Last, First. "Title of the Article in Title Case." Title of the
   Journal in Italics 45, no. 2 (2023): 147-72.
   https://doi.org/10.xxxx/xxxx.

The structure is the same as Chicago 17: notes use commas and parenthesized publication years, bibliography entries use periods and unparenthesized years.

Full note for a book:

2. First Last, Title of the Book in Italics (Place: Publisher,
   Year), 47.

Bibliography entry for a book:

Last, First. Title of the Book in Italics. Place: Publisher, Year.

Full note for an edited book chapter:

3. Chapter Author First Last, "Title of the Chapter," in Title
   of the Book in Italics, ed. Editor First Last (Place: Publisher,
   Year), 147-72.

Full note for a thesis or dissertation (more common in Turabian work than Chicago because students cite each other's theses):

4. First Last, "Title of the Thesis" (PhD diss., University Name,
   Year), 47.

Full note for a website article:

5. First Last, "Title of the Page," Site Name, last modified
   Month Day, Year, https://url.

The turabian footnote format follows Chicago 17 logic across all standard source types. The differences from Chicago are at the document level: title page format, margin requirements (1 inch all around in Turabian; CMOS leaves these to the publisher), and heading-level conventions for thesis chapters. These are the rules that justify Turabian as a separate manual; the citation rules themselves are Chicago's.

Use shortened notes from the second citation of any source onward. Turabian 9e, like CMOS 17, discourages "ibid." In favor of shortened notes. Some older committees still accept ibid., and Turabian 9e permits it where the previous note cites the same source exclusively. When in doubt, use shortened notes.

Turabian Author-Date: in-text and reference list

Author-Date uses parenthetical citations in the text and a reference list at the end. It is structurally close to APA and identical to Chicago AD.

Parenthetical:

The intervention reduced symptoms in 64% of participants (Smith 2023, 47).

Narrative:

Smith (2023, 47) reported a 64% reduction in symptoms.

Note the comma between year and page in Turabian AD: (Smith 2023, 47), not (Smith 2023: 47) or (Smith, 2023, 47). The space between year and page, with a comma after the year, is the Chicago-Turabian convention.

Two authors are joined by "and" both inside and outside parentheses.

(Smith and Jones 2023, 47).
Smith and Jones (2023) found...

Three or more authors use "et al." from the first citation, the same rule as Chicago, APA 7, and MLA 9.

(Smith et al. 2023, 47).

Reference list entry for a journal article:

Last, First. 2023. "Title of the Article in Title Case." Title of
   the Journal in Italics 45 (2): 147-72.
   https://doi.org/10.xxxx/xxxx.

The year goes here. Issue numbers are parenthesized; volume numbers are not.

Reference list entry for a book:

Last, First. 2023. Title of the Book in Italics. Place: Publisher.

Reference list entry for an edited book chapter:

Chapter Author Last, First. 2023. "Title of the Chapter." In Title
   of the Book in Italics, edited by Editor First Last, 147-72.
   Place: Publisher.

The turabian bibliography format in AD mode mirrors Chicago 17 AD line for line. Reference list entries use periods, italicize journal and book titles, and put issue numbers in parentheses. In practice, the Chicago and Turabian AD systems are essentially interchangeable; programs that ask for one will accept the other.

How to cite ChatGPT, Claude, Gemini, and DeepSeek in Turabian

The University of Chicago Press began publishing guidance on citing generative AI in early 2023 through CMOS Online. The 9th edition of Turabian predates the LLM era and does not address AI tools in the printed manual; current guidance lives in CMOS Online extra pages, which apply to both Chicago and Turabian users.

For Notes-Bibliography, the recommended pattern treats the AI tool as the author and the company as the publisher, with the prompt as the content title in quotation marks.

A full note for ChatGPT in NB:

1. ChatGPT, response to "Examples of dramatic irony in Hamlet,"
   OpenAI, March 8, 2026, https://chat.openai.com.

For Claude:

2. Claude, response to "Summarize the critical reception of Beloved,"
   Anthropic, May 12, 2026, https://claude.ai.

For Gemini:

3. Gemini, response to "Outline a five-paragraph essay on Gatsby,"
   Google, June 4, 2026, https://gemini.google.com.

For DeepSeek:

4. DeepSeek, response to "Translate this passage into modern English,"
   DeepSeek, June 17, 2026, https://chat.deepseek.com.

In-text citation (Author-Date): Tool name and year, prompt and full details in reference list.

In text: (ChatGPT 2026).
Reference list: ChatGPT. 2026. Response to "Examples of dramatic
   irony in Hamlet." OpenAI. March 8.
   https://chat.openai.com.

CMOS Online and the University of Chicago Press guidance suggest it's best to keep the full prompt and response in an appendix if the AI output is part of the analysis. Citation points; appendix is where the committee can check the evidence. Many humanities thesis programs are asking for the AI use to be included in the methods chapter or as a standalone AI use statement at the beginning of the thesis. Our AI disclosure statement guide covers the disclosure part. Citations and disclosures are two different things, and many committees are asking for both.

Cite the model only when the output appears in your thesis. If one used an LLM to brainstorm a research question or to come up with a list of sources to read, the model is disclosed but not cited; the sources one actually read go in the bibliography.

The 7 Turabian mistakes our editors catch most often

Last 12 months of thesis and dissertation chapters came through our editors. These are the most common Turabian errors. None are exotic. All of them are easy to miss when one has been staring at the same chapter for three weeks.

1. Confusing Turabian formatting with Chicago formatting at the document level. Citation rules are identical; thesis formatting is not. Turabian specifies 1-inch margins, double-spaced body text, single-spaced notes, and page numbers in the upper right. Chicago leaves these to the publisher.

2. Mixing Notes-Bibliography and Author-Date in the same thesis. A footnote on page 3 and a parenthetical (Smith 2023) on page 7 is the most common Turabian tell that the author was working from two examples at once. Decide which system before the first chapter and apply it everywhere.

3. Using "ibid." instead of shortened notes. Turabian 9e, like CMOS 17, discourages ibid. in favor of shortened notes for repeated citations. Older committees may accept ibid., but the safer default is the shortened-note form.

4. Wrong heading levels in thesis chapters. Turabian specifies five heading levels with distinct formatting: centered bold, centered regular, left-aligned bold, left-aligned italic, paragraph-style. Using only one or two levels throughout, or jumping levels inconsistently, is a thesis-formatting error rarely covered by Chicago.

5. Title page that does not match the program's variant. Most grad programs have their own Turabian title page template. This may be different from the 9e default. If they're different, then use one's program's template, not the manual's.

6. Bibliography entries that do not match footnote sources. Each item listed in a footnote must be listed in the bibliography (NB) or reference list (AD). The bibliography entry should include the full range of pages for the article (not just the page you quoted). Checked by committees, also checked by external examiners.

7. AI use disclosed nowhere. Turabian 9e is pre-LLM and many committees now expect the use of AI to be mentioned in an AI use statement at the beginning of the thesis or in the methods chapter. This does not need to be part of the reference list citation. Failure to mention it is the fastest-emerging Turabian error of 2026.

If your thesis is 80,000 words long with 400 references scattered across nine chapters, you can't check them all with a word processor. You can only check all seven of these errors if you have a proofreader who retains your academic citations.

Citation tools that actually understand Turabian

The right tool depends on what you are doing.

Turabian reference generator is for if you are building a single Turabian reference and want to copy-paste a clean entry. Note that most reference managers and citation generators ship "Chicago 17 (Notes-Bibliography)" as their Turabian-compatible style. For example, Scribbr, BibGuru, and MyBib will all generate compatible Turabian entries from a DOI, ISBN, or URL. If you want a single-stop shop to do this with your existing citations, we've you covered too! Our AI proofreader handles Turabian along with APA 7, MLA 9, Chicago 17, IEEE, Harvard, Vancouver, and AMA inside the same editor you use for the rest of your chapter, which keeps the citation step from becoming a separate context switch.

Now let's say you already have a reference list, but want to check it for consistency. In that case, a citation checker apa mla chicago workflow is what you want. It works by reading your entries, normalizing each one, and flagging formatting drift. ReferenceChecker.org handles Turabian-compatible entries. Our tool runs inside the proofreader so you can fix the entries in the same place you fix the prose.

But suppose you want something even more sophisticated. Our AI proofreader will catch all these: Footnotes without a corresponding reference in the bibliography. References that aren't cited. Mixed NB and AD formats. Use of ibid. The heading level and title page inconsistencies mentioned earlier. It will flag everything like this. The trade-off is depth vs. speed. To do a quick single reference search, it's faster to generate. To save a week of formatting work on an 80,000 word thesis with 400 references, our proofreader is the way to go.

Our wider citation formatting overview lets you compare Turabian, Chicago, APA, MLA, and IEEE side by side if you're switching styles between a thesis chapter and a journal submission. We've a note on paraphrasers that preserve citations, which explains why generic rewriters tend to break footnote numbers and what to look for instead if you're also rewriting passages around your citations.

Turabian-Aware Proofreader for Your Thesis

Thesis-level consistency checks across footnotes, bibliography, heading levels, and front matter. Free tier covers a full thesis chapter or research paper.

Frequently asked questions

Q: What is the difference between Turabian and Chicago?

The citation rules are essentially identical. The differences are in scope: Chicago targets publishers and professional authors; Turabian targets students preparing theses, dissertations, and research papers. Turabian also includes detailed guidance on thesis formatting (title pages, margins, heading levels) that Chicago leaves to the publisher.

Q: How do I cite ChatGPT in Turabian?

Use the Chicago-Turabian pattern published in CMOS Online guidance. For Notes-Bibliography, a full note reads: ChatGPT, response to "Prompt text," OpenAI, Month Day, Year, URL. For Author-Date, the in-text citation is (ChatGPT 2026) and the reference list entry reads: ChatGPT. 2026. Response to "Prompt text." OpenAI. Month Day. URL. Keep the full prompt and response in an appendix when the AI output is part of your argument.

Q: Should I use Notes-Bibliography or Author-Date in Turabian?

The choice is determined by one's discipline and one's committee. Humanities theses (history, philosophy, theology, art history, literature, classics) use Notes-Bibliography. Sciences, social sciences, and some interdisciplinary fields use Author-Date. Check one's program's thesis handbook before drafting. If neither specifies and one's supervisor has no opinion, default to NB for humanities work and AD for science-adjacent work.

Q: Can I use Chicago references in a Turabian thesis?

Yes, in practice. Reference managers like Zotero and Mendeley produce Turabian-compatible output when set to Chicago 17 NB or AD. The differences that matter are in document formatting (title page, margins, heading levels), not in the references themselves. Format the document to Turabian 9e and let the manager produce Chicago-compatible citations.

Q: Do I need to disclose AI use in my Turabian thesis?

Yes, increasingly so. Turabian 9e predates the LLM era and doesn't speak to AI directly. Most American graduate programs expect that one will disclose one's use of AI in one of two ways: either as a standalone AI use statement at the beginning of one's thesis, or in one's methods chapter (not counting a reference list citation). See our guide to writing an AI use disclosure statement for the templates programs and committees now accept.