MLA
Stewart, E. A. Man Posing at a Piano. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 10. https://digital.library.emory.edu/purl/385n8pk0vq-cor.
APA, 6th edition
Stewart, E. A. Man posing at a piano (Box 10) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/385n8pk0vq-cor.
Chicago
Stewart, E. A. “Man Posing at a Piano.” Black-and-white photographs. Robert Langmuir African American Photograph Collection, n.d. Box 10. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/385n8pk0vq-cor.