MLA
Spencer, Thomas. Unknown Confederate Soldier's Gravesite at South Bend Cemetery in Atlanta, Georgia. 1940. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 14, Folder 5. https://digital.library.emory.edu/purl/40644j10r2-cor.
APA, 6th edition
Spencer, T. (1940). Unknown Confederate soldier's gravesite at South Bend Cemetery in Atlanta, Georgia (Box 14, Folder 5) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/40644j10r2-cor.
Chicago
Spencer, Thomas. “Unknown Confederate Soldier's Gravesite at South Bend Cemetery in Atlanta, Georgia.” Black-and-white photographs. Civil War Collection, 1940. Box 14, Folder 5. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/40644j10r2-cor.