MLA
Spencer, Thomas. Covered Bridge in Cynthiana, Kentucky Used during the Civil War. 1937. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 15, Folder 3. https://digital.library.emory.edu/purl/81289320jm-cor.
APA, 6th edition
Spencer, T. (1937). Covered bridge in Cynthiana, Kentucky used during the Civil War (Box 15, Folder 3) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/81289320jm-cor.
Chicago
Spencer, Thomas. “Covered Bridge in Cynthiana, Kentucky Used during the Civil War.” Black-and-white photographs. Civil War Collection, 1937. Box 15, Folder 3. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/81289320jm-cor.