MLA
Spencer, Thomas. Old Fort Post Office in Georgia. 1940. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 15, Folder 2. https://digital.library.emory.edu/purl/450gtht8b4-cor.
APA, 6th edition
Spencer, T. (1940). Old Fort post office in Georgia (Box 15, Folder 2) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/450gtht8b4-cor.
Chicago
Spencer, Thomas. “Old Fort Post Office in Georgia.” Black-and-white photographs. Civil War Collection, 1940. Box 15, Folder 2. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/450gtht8b4-cor.