MLA
Spencer, Thomas. Monument for Confederate General Leonidas Polk at Pine Mountain near Marietta, Georgia. 1923. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 14, Folder 21. https://digital.library.emory.edu/purl/0580k6dkkm-cor.
APA, 6th edition
Spencer, T. (1923). Monument for Confederate general Leonidas Polk at Pine Mountain near Marietta, Georgia (Box 14, Folder 21) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0580k6dkkm-cor.
Chicago
Spencer, Thomas. “Monument for Confederate General Leonidas Polk at Pine Mountain near Marietta, Georgia.” Black-and-white photographs. Civil War Collection, 1923. Box 14, Folder 21. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0580k6dkkm-cor.