MLA
Spencer, Thomas. Marker Where Confederate General Joseph Wheeler Defeated Union Troops in 1865 near Newnan, Georgia. 1940. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 15, Folder 1. https://digital.library.emory.edu/purl/1848pk0q6j-cor.
APA, 6th edition
Spencer, T. (1940). Marker where Confederate general Joseph Wheeler defeated Union troops in 1865 near Newnan, Georgia (Box 15, Folder 1) [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1848pk0q6j-cor.
Chicago
Spencer, Thomas. “Marker Where Confederate General Joseph Wheeler Defeated Union Troops in 1865 near Newnan, Georgia.” Black-and-white photographs. Civil War Collection, 1940. Box 15, Folder 1. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1848pk0q6j-cor.