MLA
Spencer, Thomas. Couple in Front of Civil War Cannons at Lookout Mountain near Chattanooga, Tennessee. 1940. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 15, Folder 7. https://digital.library.emory.edu/purl/061djh9x4v-cor.
APA, 6th edition
Spencer, T. (1940). Couple in front of Civil War cannons at Lookout Mountain near Chattanooga, Tennessee (Box 15, Folder 7) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/061djh9x4v-cor.
Chicago
Spencer, Thomas. “Couple in Front of Civil War Cannons at Lookout Mountain near Chattanooga, Tennessee.” Black-and-white photographs. Civil War Collection, 1940. Box 15, Folder 7. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/061djh9x4v-cor.