MLA
Spencer, Thomas. Confederate Marker at the Battlefield in Olustee, Florida. The Battle of Olustee Was Fought on February 20, 1864 and Was the Only Major Battle Fought in Florida during the War. 1950. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 14, Folder 2. https://digital.library.emory.edu/purl/006sxksp3q-cor.
APA, 6th edition
Spencer, T. (1950). Confederate marker at the battlefield in Olustee, Florida. The Battle of Olustee was fought on February 20, 1864 and was the only major battle fought in Florida during the war (Box 14, Folder 2) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/006sxksp3q-cor.
Chicago
Spencer, Thomas. “Confederate Marker at the Battlefield in Olustee, Florida. The Battle of Olustee Was Fought on February 20, 1864 and Was the Only Major Battle Fought in Florida during the War.” Black-and-white photographs. Civil War Collection, 1950. Box 14, Folder 2. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/006sxksp3q-cor.