MLA
Spencer, Thomas. Etowah Mounds near Cartersville, Georgia. Union General William Sherman Visited the Site in 1844 and 1864. 1925. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 14, Folder 6. https://digital.library.emory.edu/purl/2085hqc0qr-cor.
APA, 6th edition
Spencer, T. (1925). Etowah Mounds near Cartersville, Georgia. Union general William Sherman visited the site in 1844 and 1864 (Box 14, Folder 6) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/2085hqc0qr-cor.
Chicago
Spencer, Thomas. “Etowah Mounds near Cartersville, Georgia. Union General William Sherman Visited the Site in 1844 and 1864.” Black-and-white photographs. Civil War Collection, 1925. Box 14, Folder 6. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/2085hqc0qr-cor.