MLA
Spencer, Thomas. McKelney[?] House in Bartow County, Georgia. On May 19, 1864, There Was a Confederate States Army Conference Held There. 1925. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 14, Folder 6. https://digital.library.emory.edu/purl/235gb5mmqh-cor.
APA, 6th edition
Spencer, T. (1925). McKelney[?] House in Bartow County, Georgia. On May 19, 1864, there was a Confederate States Army conference held there (Box 14, Folder 6) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/235gb5mmqh-cor.
Chicago
Spencer, Thomas. “McKelney[?] House in Bartow County, Georgia. On May 19, 1864, There Was a Confederate States Army Conference Held There.” 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/235gb5mmqh-cor.