"When the audience [your instructor] you are writing for can retrieve the works you used, cite the works using the formats shown in Chapter 10. . . . However, if the work is intended for professional publication or intended for a wider audience who will not have access to these sources, cite the sources as personal communications."
(Publication Manual of the American Psychological Association, 2020, p. 259)
Example:
Lebedick, N. (2020). Morphology of mammals [PowerPoint slides]. Brightspace. https://cmtn.desire2learn.com/d2l/login
Narrative citation: Lebedick (2020)
Parenthetical citation: (Lebedick, 2020)