MLA
Spencer, Thomas. Old Pear Tree in Perryville, Kentucky That Was Standing during the Battle of Perryville on October 8, 1862. 1923. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 15, Folder 3. https://digital.library.emory.edu/purl/8708w9gk32-cor.
APA, 6th edition
Spencer, T. (1923). Old pear Tree in Perryville, Kentucky that was standing during the Battle of Perryville on October 8, 1862 (Box 15, Folder 3) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8708w9gk32-cor.
Chicago
Spencer, Thomas. “Old Pear Tree in Perryville, Kentucky That Was Standing during the Battle of Perryville on October 8, 1862.” Black-and-white photographs. Civil War Collection, 1923. Box 15, Folder 3. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8708w9gk32-cor.