MLA
Strouse, Stanley. Musicians Gathered around a Piano in the Little Rathskeller Club. 1939. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 23. https://digital.library.emory.edu/purl/491fj6q5bw-cor.
APA, 6th edition
Strouse, S. (1939). Musicians gathered around a piano in the Little Rathskeller club (Box 23) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/491fj6q5bw-cor.
Chicago
Strouse, Stanley. “Musicians Gathered around a Piano in the Little Rathskeller Club.” Black-and-white photographs. Robert Langmuir African American Photograph Collection, 1939. Box 23. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/491fj6q5bw-cor.