MLA
Walter, Bob and Bill the 3 Peppers Playing the Cello, Guitar and Piano. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 36. https://digital.library.emory.edu/purl/3009w0vt8s-cor.
APA, 6th edition
Walter, Bob and Bill the 3 peppers playing the cello, guitar and piano (Box 36). [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3009w0vt8s-cor.
Chicago
“Walter, Bob and Bill the 3 Peppers Playing the Cello, Guitar and Piano.” Black-and-white photographs. Robert Langmuir African American Photograph Collection, n.d. Box 36. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3009w0vt8s-cor.