Cite a lecture using Modern Language Association, or MLA, style in the bibliography and in the text. For the bibliography, list the name of the speaker, the title of the lecture (if available and in italics), the name of the organization (in most cases the university), the location of the lecture and the date it was given. You should also specify that this was a lecture, and not a speech, reading, presentation or other form of address. For example:
Smith, Carol. History of the Byzantine Empire. Columbia University. History Building, New York City, NY. 7 April 2009. Lecture.
Mention the professor in the text of the paper for an in-text MLA citation. For example: Carol Smith gave a lecture on the Byzantine Empire that discussed several aspects of the empire.
Make an in-text citation with American Psychological Association, or APA, formatting by putting the author's last name, first initial, the words "personal communication" and the date the lecture was given in parentheses. For example: (C. Smith, personal communication, April 7, 2009). You do not cite personal communication in a bibliography in APA style.
Cite with Chicago style by using footnotes in-the text. You need the professor's name, the name of the lecture, the type of address, the location and the date. For example: Carol Smith, "History of the Byzantine Empire" (lecture, Columbia University, New York City, NY, April 7, 2009). The bibliography listing is the same as the footnote but with the last name first. For example: Smith, Carol instead of Carol Smith.