Cite an image from a slide presentation on the web the same way you would cite an image on a web page. Indicate the slide and its number, either in the optional-element slot at the end of the entry or in a parenthetical citation in your text:

Benton, Thomas Hart. Instruments of Power. 1930–31. The Met, Metropolitan Museum of Art, www.metmuseum.org/blogs/now-at-the-met/from-the-director/2012/benton/slideshow. Slide 1.

Thomas Hart Benton’s panel Instruments of Power is part a larger mural (slide 1).

Cite an image from a slide presentation that you viewed in person by providing the name of the presenter as the author if the author created the image in the slide. Then provide the title of the image as the title of the source. Provide the name of the presentation or the name of the class as the title of the container. Then provide the date and the location. Indicate the slide and its number in the optional-element slot at the end of the entry or in a parenthetical citation in your text:

Smith, Ryan. “Goals of the Course.” English 204: African American Literature, 4 Apr. 2016, Evergreen State College, Olympia. Slide 2.

Smith indicates that one of the goals of the course is to “understand African American literature in all its variety” (slide 2).

If the presenter did not create the image in the slide, provide information about the original, if known:

Monet, Claude. Bridge over a Pond of Water Lilies. 1899. Introduction to the History of Art, taught by Jane Ford, 4 Apr. 2016, Bates College, Lewiston. Slide 2.