MLA
Guitar Pete Playing Harmonica and Another Man Playing Guitar. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 3. https://digital.library.emory.edu/purl/569z08kpxt-cor.
APA, 6th edition
Guitar Pete playing harmonica and another man playing guitar (Box 3). [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/569z08kpxt-cor.
Chicago
“Guitar Pete Playing Harmonica and Another Man Playing Guitar.” Black-and-white photographs. Robert Langmuir African American Photograph Collection, n.d. Box 3. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/569z08kpxt-cor.