MLA
Spencer, Thomas. Historical Marker Site of the Battle of Brown's Mill in Coweta County, Georgia. 1955. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 15, Folder 1. https://digital.library.emory.edu/purl/583kwh71vv-cor.
APA, 6th edition
Spencer, T. (1955). Historical marker site of the Battle of Brown's Mill in Coweta County, Georgia (Box 15, Folder 1) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/583kwh71vv-cor.
Chicago
Spencer, Thomas. “Historical Marker Site of the Battle of Brown's Mill in Coweta County, Georgia.” Black-and-white photographs. Civil War Collection, 1955. Box 15, Folder 1. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/583kwh71vv-cor.