MLA
Spencer, Thomas. Ruins of Factory in Marietta, Georgia. Destroyed by Union Troops in 1864. 1940. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 14, Folder 10. https://digital.library.emory.edu/purl/177fqz623m-cor.
APA, 6th edition
Spencer, T. (1940). Ruins of factory in Marietta, Georgia. Destroyed by Union troops in 1864 (Box 14, Folder 10) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/177fqz623m-cor.
Chicago
Spencer, Thomas. “Ruins of Factory in Marietta, Georgia. Destroyed by Union Troops in 1864.” Black-and-white photographs. Civil War Collection, 1940. Box 14, Folder 10. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/177fqz623m-cor.