MLA
Spencer, Thomas. Three Men, Yates, Spencer and Terryman[?], at the Ferry over the Coosa River in Georgia. 1940. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 15, Folder 2. https://digital.library.emory.edu/purl/484mkkwj92-cor.
APA, 6th edition
Spencer, T. (1940). Three men, Yates, Spencer and Terryman[?], at the ferry over the Coosa River 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/484mkkwj92-cor.
Chicago
Spencer, Thomas. “Three Men, Yates, Spencer and Terryman[?], at the Ferry over the Coosa River 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/484mkkwj92-cor.