MLA
Spencer, Thomas. 1908 Indiana Memorial in Andersonville National Historic Site to Commemorate the 702 Known Indiana Union Soldiers Who Died at Andersonville Prison. 1950. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 14, Folder 4. https://digital.library.emory.edu/purl/651vdnckx1-cor.
APA, 6th edition
Spencer, T. (1950). 1908 Indiana Memorial in Andersonville National Historic Site to commemorate the 702 known Indiana Union soldiers who died 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/651vdnckx1-cor.
Chicago
Spencer, Thomas. “1908 Indiana Memorial in Andersonville National Historic Site to Commemorate the 702 Known Indiana Union Soldiers Who Died at Andersonville Prison.” Black-and-white photographs. Civil War Collection, 1950. Box 14, Folder 4. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/651vdnckx1-cor.