MLA
Spencer, Thomas. Inscription Found in the Andersonville National Cemetery at the Andersonville National Historic Site, Which Contains the Traves of 13,714 Union Solder Graves Who Died While Confined at Andersonville Prison. 1937. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 14, Folder 4. https://digital.library.emory.edu/purl/402q573p8m-cor.
APA, 6th edition
Spencer, T. (1937). Inscription found in the Andersonville National Cemetery at the Andersonville National Historic Site, which contains the traves of 13,714 Union solder graves who died while confined at Andersonville Prison (Box 14, Folder 4) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/402q573p8m-cor.
Chicago
Spencer, Thomas. “Inscription Found in the Andersonville National Cemetery at the Andersonville National Historic Site, Which Contains the Traves of 13,714 Union Solder Graves Who Died While Confined at Andersonville Prison.” Black-and-white photographs. Civil War Collection, 1937. Box 14, Folder 4. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/402q573p8m-cor.