How to Cite a Lecture or Class Notes

Your professor makes a claim in class that you want to use in your paper – a statistic, an argument, a framework – and it exists nowhere else in print. There’s no journal article behind it, no textbook page number, nothing to paste into a search bar. Citing a lecture feels different from citing anything else you’ve formatted so far, because the source itself is a live event rather than a fixed document, and every citation style has to solve that problem differently.

This guide covers a single example lecture formatted in all six major citation styles, along with the variations you’ll hit for unrecorded classes, guest speakers, and your own class notes.

Why Lecture Citations Work Differently

Most sources you cite are fixed and retrievable – a reader can find the same article, book, or webpage you did. A live, unrecorded lecture isn’t retrievable in that sense; your reader can’t go watch what you watched. Some styles (APA, Chicago) respond to this by treating an unrecorded lecture as a personal communication, cited only in the body of your paper and left out of the reference list entirely. Others (MLA, Harvard, IEEE, Vancouver) still create a formal reference entry, on the reasoning that documenting what you consulted matters even when a reader can’t retrieve the exact recording. Whether your lecture was recorded and posted online changes which of these rules applies.

Here’s the example we’ll use throughout: a lecture titled “Genetic Privacy in the Age of Big Data,” delivered by Professor Aisha Bello for an Introduction to Bioethics course at Northwestern University on October 14, 2025, and later posted to the university’s course portal.

APA 7th Edition

Bello, A. (2025, October 14). Genetic privacy in the age of big data [Lecture]. Northwestern University. https://ocw.northwestern.edu/bioethics/lecture-14

The lecture title is in sentence case with no italics, matching APA’s treatment of unpublished works
“[Lecture]” identifies the format, the same way “[Video]” or “[Audio podcast episode]” flag other non-print sources
Because the lecture is posted and retrievable, it earns a full reference list entry with a URL

MLA 9th Edition

Bello, Aisha. “Genetic Privacy in the Age of Big Data.” Introduction to Bioethics, Northwestern University, 14 Oct. 2025, ocw.northwestern.edu/bioethics/lecture-14. Lecture.

The course name functions as the container, the same role a journal or podcast series plays for other sources
“Lecture” appears as a supplemental element at the end, identifying the source type
Full first name throughout – never an initial

Chicago (Notes-Bibliography)

Footnote:

Aisha Bello, “Genetic Privacy in the Age of Big Data” (lecture, Introduction to Bioethics, Northwestern University, October 14, 2025), https://ocw.northwestern.edu/bioethics/lecture-14.

Bibliography:

Bello, Aisha. “Genetic Privacy in the Age of Big Data.” Lecture, Introduction to Bioethics, Northwestern University, October 14, 2025. https://ocw.northwestern.edu/bioethics/lecture-14.

“Lecture” identifies the source type immediately after the title, parallel to how Chicago labels a podcast as “audio podcast”
The month is spelled out in full, following Chicago’s usual date convention

Harvard

Bello, A. (2025) ‘Genetic privacy in the age of big data’ [Lecture]. Introduction to Bioethics. Northwestern University, 14 October. Available at: https://ocw.northwestern.edu/bioethics/lecture-14 (Accessed: 20 October 2025).

The lecture title sits in single quotation marks, Harvard’s standard convention
An access date is required since the lecture recording is an online source

IEEE

[1] A. Bello, “Genetic privacy in the age of big data,” lecture, Introduction to Bioethics, Northwestern Univ., Evanston, IL, USA, Oct. 14, 2025. [Online]. Available: https://ocw.northwestern.edu/bioethics/lecture-14

Author initials precede the last name, IEEE’s standard order
The institution’s location (city, state, country) is included, unlike APA or MLA

Vancouver

Bello A. Genetic privacy in the age of big data [lecture]. Introduction to Bioethics. Evanston (IL): Northwestern University; 2025 Oct 14 [cited 2025 Oct 20]. Available from: https://ocw.northwestern.edu/bioethics/lecture-14

No periods in the author’s initials
“[cited ...]” records the access date, matching Vancouver’s website conventions

When the Lecture Isn’t Recorded

Most classroom lectures never get posted anywhere – they happen once and exist only in the room. How each style handles that depends on its philosophy about recoverable sources.

APA and Chicago treat an unrecorded lecture as a personal communication – a category APA Style documents in detail, alongside emails, unarchived interviews, and other unrecoverable sources. It gets cited in the body of your paper but never appears in the reference list or bibliography, since a reader has no way to retrieve it:

APA: (A. Bello, personal communication, October 14, 2025)
Chicago footnote: 1. Aisha Bello, in discussion with the author, October 14, 2025.

MLA, Harvard, IEEE, and Vancouver still expect a formal entry, using the course and institution in place of a URL:

MLA: Bello, Aisha. “Genetic Privacy in the Age of Big Data.” Introduction to Bioethics, Northwestern University, 14 Oct. 2025. Lecture.
Harvard: Bello, A. (2025) ‘Genetic privacy in the age of big data’ [Lecture]. Introduction to Bioethics, Northwestern University, 14 October.

The formatting barely changes between the recorded and unrecorded versions in these four styles – only the URL and access date drop out.

Citing Your Own Class Notes

If you’re citing something the professor said, based on your own notes from the lecture rather than a posted recording or slide deck, cite the lecture itself using the rules above, not “personal class notes” as a separate source category. Your notes are evidence of what was said; the lecture itself is the actual source. Keep the exact date – lecture citations depend entirely on which specific class session you’re referencing, since the same course meets many times across a semester.

Guest Lectures

When a guest speaker addresses a class, credit the guest as the author, not the instructor who invited them – the course and institution still identify the venue, but the guest delivered the content you’re citing:

Marchetti, H. (2025, November 3). Regulatory gaps in AI-assisted diagnostics [Guest lecture]. Introduction to Bioethics, Northwestern University.

If the guest lecture is later referenced elsewhere as part of a formal publication or working paper the guest circulated separately, cite that document using our report and white paper citation guide instead – a published handout follows different rules than a live talk.

In-Text Citations for Lecture Material

In-text treatment follows each style’s usual author-date or author-page rules, with one adjustment: since lectures rarely have page numbers, most styles reference the date or, for a personal communication, nothing beyond the parenthetical itself. For the complete breakdown of in-text formats across every style – including how to handle sources with no page numbers – see our in-text citations guide.

Quick Reference Table

Element	APA	MLA	Chicago	Harvard	IEEE	Vancouver
Title case	Sentence case	Title case	Title case	Sentence case	Sentence case	Sentence case
Format label	[Lecture]	“Lecture” (trailing)	“lecture” (parenthetical)	[Lecture]	“lecture”	[lecture]
Unrecorded lecture	Personal communication, no entry	Full entry, no URL	Footnote only, no entry	Full entry, no URL	Full entry, no URL	Full entry, no URL
Access date required	No	No	No	Yes (if online)	No	Yes (if online)

Like a newspaper citation, a lecture citation changes shape depending entirely on how you accessed it – live and unrecorded, or posted and retrievable. Our guide on citing a newspaper article walks through that same access-dependent logic applied to a very different source type, and it’s worth comparing the two if the pattern hasn’t clicked yet.

Common Mistakes

Crediting the course instructor instead of a guest speaker. The person who delivered the content is the author, regardless of whose class it was.
Adding a reference list entry for an unrecorded lecture in APA or Chicago. Both styles keep unrecorded lectures out of the formal list entirely – cite them in-text or in a footnote only.
Omitting the exact date. Unlike a book or journal article, a lecture citation loses its identifying value without the specific session date, since a course meets repeatedly.
Treating slides as identical to the spoken lecture. If your professor posts a separate PDF of slides or a handout, that’s a distinct source with its own citation rules – don’t cite it as if it were the lecture recording itself.
Forgetting the course name as the container. MLA, Harvard, and Vancouver all expect the course to appear somewhere in the entry, functioning the way a journal or publisher would for other source types.

For a broader look at how “recoverability” and access-dependent rules apply across less common source types, see our guide on reports and white papers.

Try It with CiteTools

Lecture citations force you to think about a source differently than a URL or a DOI – there’s no metadata to auto-fill when a professor’s words only exist in your notes. Once you’ve gathered the course name, institution, and exact date, paste the details into CiteTools.io and get a correctly formatted citation in APA, MLA, Chicago, Harvard, IEEE, or Vancouver, without memorizing which style keeps unrecorded lectures out of the reference list.