MLA
Samuel Alexander with Dog on Steps. 1930. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 16. https://digital.library.emory.edu/purl/641mgqnkm9-cor.
APA, 6th edition
Samuel Alexander with dog on steps (Box 16). (1930). [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/641mgqnkm9-cor.
Chicago
“Samuel Alexander with Dog on Steps.” Black-and-white photographs. Robert Langmuir African American Photograph Collection, 1930. Box 16. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/641mgqnkm9-cor.