MLA
Harmon, Brad. Identified Speakers and Entertainers - Rathskellar Cast Members, Linda Capobianco and Mark Peters in the ???Trilogy of EG[?]??? Sketch. 1983. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 13. https://digital.library.emory.edu/purl/163stqjqnb-cor.
APA, 6th edition
Harmon, B. (1983). Identified Speakers and Entertainers - Rathskellar cast members, Linda Capobianco and Mark Peters in the ???Trilogy of EG[?]??? sketch (Box 6, Folder 13) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/163stqjqnb-cor.
Chicago
Harmon, Brad. “Identified Speakers and Entertainers - Rathskellar Cast Members, Linda Capobianco and Mark Peters in the ???Trilogy of EG[?]??? Sketch.” Black-and-white photographs. Emory University Office of Alumni Publications Photographs, 1983. Box 6, Folder 13. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/163stqjqnb-cor.