Thesis or Dissertation Citation in APA, MLA, Chicago and Harvard

Style rules checked October 23, 2026 · Next check by January 21, 2027 · AI-assisted source and citation checks; not human review

Examples in every style

Real repository dissertation: Stephen Hawking

The Apollo record identifies Stephen W. Hawking, the thesis title, PhD and University of Cambridge. Cambridge's own accompanying announcement confirms 1966; the 2017 open-access announcement is not substituted for the thesis year.

Synthetic unpublished master's thesis

Illustrative metadata only: an unpublished master's thesis with no database number, DOI or public URL. Example University is fictional; this is not a real student work. The source details in this example are made up to show the format.

How the styles differ for this source

Edge cases

• The thesis is available in a university repository. For APA, repository availability places the thesis in the published-thesis branch. It does not need a commercial publisher or an ISBN. Style guide. Applies to APA Style 7th edition.
• The database gives a publication number. Retain a supplied database publication number after the thesis title; do not invent one from a repository handle or URL. Style guide. Applies to APA Style 7th edition.
• The thesis has no recoverable repository or database copy. APA's unpublished-thesis form identifies its unpublished status and the degree-awarding institution. A private file is not automatically a public repository publication. Style guide. Applies to APA Style 7th edition.
• You found a digitized copy decades after submission. Use the thesis year, not the repository announcement date. Cambridge explicitly describes Hawking's work as a 1966 doctoral thesis in its 2017 announcement. Style guide. Applies to APA Style 7th edition, MLA Handbook 9th edition, Chicago Manual of Style 18th edition (notes and bibliography), Cite Them Right 12th edition (author-date/Harvard).

Common mistakes

Using the repository upload year as the dissertation year

Digitization and submission are different events. The real example distinguishes a 1966 thesis from a 2017 announcement.

Not this: Hawking dissertation dated 2017 because the open-access news appeared then

Do this (APA Style 7th edition, reference list entry): Hawking, S. W. (1966). Properties of expanding universes [Doctoral dissertation, University of Cambridge]. Apollo. https://doi.org/10.17863/CAM.11283

Calling every dissertation unpublished

APA explicitly treats repository and database theses as published sources.

Not this: Unpublished label added to a public repository dissertation

Do this (Chicago Manual of Style 18th edition (notes and bibliography), reference list entry): Hawking, Stephen W. “Properties of Expanding Universes.” Doctoral dissertation, University of Cambridge, 1966. Apollo. https://doi.org/10.17863/CAM.11283.

Inventing a ProQuest number for a repository item

An identifier belongs to the system that issued it. A DOI or handle is not a ProQuest publication number.

Not this: A repository URL number moved into Publication No.

Do this (MLA Handbook 9th edition, reference list entry): Hawking, Stephen W. Properties of Expanding Universes. 1966, Apollo, https://doi.org/10.17863/CAM.11283. University of Cambridge, Doctoral dissertation.

Check before you cite

• Identify the author, exact thesis title and submission year.
• Verify the degree and institution from the repository or title page.
• Decide whether the copy is published in a database/repository or genuinely unpublished.
• Record a publication number only when the database supplies one.
• Use a DOI or public resolving URL rather than a signed library-session link.

Is this the right source type?

Look first at the object you consulted, not at the label attached to the word dissertation in everyday conversation. A degree thesis can be publicly available in a repository without ever becoming a book. APA explicitly treats that repository copy as published, while an unpublished thesis follows a different branch. Check the repository record and the title page for the author's name, degree, awarding institution and submission year; then decide which retrieval details actually belong to your copy. The Hawking example makes the date problem concrete: Cambridge announced open access in 2017, but the same announcement identifies the work as a 1966 doctoral thesis. A repository's upload or digitization year must not silently replace the thesis year. The synthetic second example illustrates an unpublished master's thesis and intentionally has neither a URL nor a publication number. If you instead used a journal article derived from a dissertation, cite the article as an article; shared research does not make those documents interchangeable. The four columns are generated from the supplied metadata, with the assigned style and any stated engine limitations checked before use.

Frequently asked questions

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