MLA
Union Patriotic Envelope - "Camp Dennison Near Cincinnati". 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 21, Folder 7. https://digital.library.emory.edu/purl/866vx0k7mv-cor.
APA, 6th edition
Union patriotic envelope - "Camp Dennison Near Cincinnati" (Box 21, Folder 7). (1861). [Envelopes]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/866vx0k7mv-cor.
Chicago
“Union Patriotic Envelope - ‘Camp Dennison Near Cincinnati.’” Envelopes. Civil War Collection, 1861. Box 21, Folder 7. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/866vx0k7mv-cor.