MLA
Union Patriotic Envelope with Jefferson Davis Cartoon - "Co. A. Jeff D's Zouaves.". 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 21, Folder 4. https://digital.library.emory.edu/purl/2085hqc0sm-cor.
APA, 6th edition
Union patriotic envelope with Jefferson Davis cartoon - "Co. A. Jeff D's Zouaves." (Box 21, Folder 4). (1861). [Envelopes]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/2085hqc0sm-cor.
Chicago
“Union Patriotic Envelope with Jefferson Davis Cartoon - ‘Co. A. Jeff D's Zouaves.".” Envelopes. Civil War Collection, 1861. Box 21, Folder 4. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/2085hqc0sm-cor.