MLA
Umbrella Rock near Chattanooga, Tennessee. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 15, Folder 7. https://digital.library.emory.edu/purl/8021c5b12k-cor.
APA, 6th edition
Umbrella Rock near Chattanooga, Tennessee (Box 15, Folder 7). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8021c5b12k-cor.
Chicago
“Umbrella Rock near Chattanooga, Tennessee.” Photographic postcards. Civil War Collection, n.d. Box 15, Folder 7. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8021c5b12k-cor.