How to Cite AI-Generated Content: APA, MLA & Chicago Formats

Every major citation style guide has now issued guidance on AI-generated content — but they have reached surprisingly different conclusions about how AI should be treated as a source. APA treats ChatGPT like a piece of software with a retrievable output. MLA treats it like a work with no author. Chicago treats it like a personal communication that belongs in a footnote but not a bibliography. These are not minor formatting variations — they reflect genuinely different ontological positions about what AI-generated text is as a knowledge source.

Understanding the logic behind each style's approach makes the specific formats easier to remember and apply correctly — and helps you navigate the cases where the style guides' official guidance does not quite fit your actual use case.

When You Must Cite AI (and When You Do Not)

Before getting into the mechanics of each citation format, the threshold question is whether citation is required at all. The answer depends on how you used AI in your work — not on which tool you used or how advanced it is.

APA 7th Edition: Citing AI as Software with a Retrievable Output

APA's approach to AI citation, updated in 2023 and refined through additional Style Center guidance in 2025, treats AI tools as software that produces retrievable outputs — similar to how APA handles citing database content or software. The key elements are: the AI company as author, the generation date as the date, the tool name and version as the title, the tool type in brackets, and a URL to a shareable chat transcript.

When no shareable URL is available — some AI tools do not generate persistent links, or links expire — the APA Style Center recommends saving the AI conversation as a PDF, noting it is a file in your possession, and indicating "Chat transcript on file with author" rather than a URL. Treat it as you would an unarchived personal communication, though APA now prefers a reference list entry over the personal communication designation when any retrievable version exists.

MLA 9th Edition: The Prompt as Title

MLA's approach — updated most recently on August 13, 2025, per the MLA Style Center — reflects MLA's established practice of treating works without personal authors by using the work's title in place of an author in citations. For AI-generated content, MLA designates the prompt (or a shortened description of it) as the title of the "work," and the AI tool as the container.

The in-text citation in MLA uses a shortened version of the prompt title in quotation marks — which can feel awkward in prose, particularly if the prompt was long or colloquial. The MLA Style Center acknowledges this and notes that writers should use a "descriptive title" rather than the literal verbatim prompt if the prompt itself would read poorly as a citation signal. Practicality takes precedence over literal adherence to the prompt text.

One important MLA-specific consideration: if you engaged in a multi-turn conversation with an AI — asking follow-up questions, providing additional context — MLA recommends either citing the specific exchange that produced the content you used, or describing the overall conversation in your methodology and citing the conversation as a whole. The August 2025 update added guidance on citing multi-turn conversations, which the 2023 guidance had not fully addressed.

Chicago 18th Edition: Footnote Only, No Bibliography

Chicago's position is the most structurally distinctive of the three major styles. Chicago's 18th edition — and the guidance published by the University of Florida Business Library and McMaster University's LibGuide, which synthesize the official Chicago guidance — classifies AI-generated content as a personal communication. Personal communications under Chicago go in footnotes or endnotes only; they do not appear in the bibliography at all.

The logic is that AI-generated text is not a stable, retrievable, archivable source the way a published book or journal article is. Different users will get different outputs from the same prompt. There is no canonical version of an AI's answer to a question the way there is a canonical version of a book chapter. Chicago reserves the bibliography for sources readers can independently verify — and AI outputs, even with shareable links, are transient enough that Chicago does not treat them as permanently retrievable.

Note that Chicago citations use no bibliography entry at all for AI content. If your paper uses Chicago style and AI is the only source for a particular claim, the information appears only in the footnote, and readers who check your bibliography will find no AI entry. This is by design — and also why many academic disciplines that use Chicago style pair it with additional disclosure requirements for AI use.

Harvard Referencing: How It Compares

Harvard referencing — widely used in UK universities, Australia, and many Commonwealth countries — treats AI similarly to APA but with British date formatting and slight structural differences. Harvard does not have a single canonical style guide in the way APA, MLA, and Chicago do; universities and publishers maintain their own Harvard variants. The Purdue University Libraries guide and Brown University LibGuide provide useful worked examples.

Disclosure Requirements: What Citation Alone Does Not Cover

A formal citation tells your reader that you used AI and where. A disclosure statement tells them how and why. Many institutions now require both — and some require disclosure without formal citation. This distinction matters because citation format addresses attribution, while disclosure addresses process transparency.

Major academic publishers including Elsevier, Springer Nature, and Wiley introduced AI authorship and disclosure policies between 2023 and 2025. Common requirements include: a named statement in the methods or acknowledgments section specifying which AI tools were used, what tasks they performed, and how the author verified or edited the output. The Nature portfolio journals and JAMA-network journals require explicit author confirmation that AI was not used to generate results, data, or conclusions — and that any AI-assisted text underwent full author review and verification.

For academic papers, our detailed guide to ethical AI use in academic writing covers journal-specific disclosure requirements and how to structure AI use statements for publication. For students specifically, AI detection guidance for students walks through what to check before submitting AI-assisted work.

Edge Cases That Trip Writers Up

When the AI cites its own sources. AI tools sometimes provide citations — but AI-generated citations are notoriously unreliable. A common failure mode is "hallucinated citations": plausible-sounding references to authors, journals, and publication dates that do not exist. Never cite a source in your paper because an AI cited it — always verify the source independently. If the AI's analysis led you to discover a real source, cite the real source, not the AI.

When AI summarizes a document you also read. If you asked an AI to summarize a paper you then read independently, cite the paper — not the AI summary. The AI served as a discovery or comprehension tool, not as the source. Only cite the AI if you are specifically referring to the AI's summary or interpretation as a distinct perspective.

When no shareable link is available. Some enterprise or institutional AI deployments do not generate public shareable links. In this case, all three style guides accept a citation without a URL, with a note that the transcript is available from the author on request. Save a copy of the conversation as a PDF for your records.

When you used AI in a language other than English. APA, MLA, and Chicago guidelines do not currently address multilingual AI citation explicitly. The practical recommendation from university library guides at Duke, NYU, and Toronto Metropolitan University is to cite in the language of your paper, with a bracketed English translation of the prompt in MLA-style citations, and to note the language used in any methodology or disclosure statement.

When you used an AI detector to verify content authenticity. If you ran a document through an AI detection tool and are reporting results — for example, in a research paper on AI detection methodology — cite the specific detection tool by name, version, and date, similar to how you would cite any software tool used in your methodology. EyeSift's tool and similar platforms should be cited as software with a URL and access date.

A Quick-Reference Comparison of All Three Styles

Frequently Asked Questions