MLA
Union Patriotic Envelope - Washington Monument. 1884. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 21, Folder 7. https://digital.library.emory.edu/purl/767wm37r28-cor.
APA, 6th edition
Union patriotic envelope - Washington Monument (Box 21, Folder 7). (1884). [Envelopes]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/767wm37r28-cor.
Chicago
“Union Patriotic Envelope - Washington Monument.” Envelopes. Civil War Collection, 1884. Box 21, Folder 7. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/767wm37r28-cor.