MLA
Spencer, Thomas. Monument in Mill Spring, Kentucky, Marking the Spot Where Confederate General Felix Zollicoffer Died on January 19, 1862. 1940. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 15, Folder 3. https://digital.library.emory.edu/purl/218dfn3092-cor.
APA, 6th edition
Spencer, T. (1940). Monument in Mill Spring, Kentucky, marking the spot where Confederate general Felix Zollicoffer died on January 19, 1862 (Box 15, Folder 3) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/218dfn3092-cor.
Chicago
Spencer, Thomas. “Monument in Mill Spring, Kentucky, Marking the Spot Where Confederate General Felix Zollicoffer Died on January 19, 1862.” Black-and-white photographs. Civil War Collection, 1940. Box 15, Folder 3. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/218dfn3092-cor.