MLA
Spencer, Thomas. Confederate Tombstone near Henderson House in Chickamauga, Georgia. 1940. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 14, Folder 21. https://digital.library.emory.edu/purl/747dr7srzf-cor.
APA, 6th edition
Spencer, T. (1940). Confederate tombstone near Henderson House in Chickamauga, Georgia (Box 14, Folder 21) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/747dr7srzf-cor.
Chicago
Spencer, Thomas. “Confederate Tombstone near Henderson House in Chickamauga, Georgia.” Black-and-white photographs. Civil War Collection, 1940. Box 14, Folder 21. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/747dr7srzf-cor.