MLA
Union Patriotic Envelope with P. G. T. Beauregard Cartoon - "Gen. Beauregard, and His Lady Love". 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 21, Folder 6. https://digital.library.emory.edu/purl/13331zcsqs-cor.
APA, 6th edition
Union patriotic envelope with P. G. T. Beauregard cartoon - "Gen. Beauregard, and his Lady Love" (Box 21, Folder 6). (1861). [Envelopes]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/13331zcsqs-cor.
Chicago
“Union Patriotic Envelope with P. G. T. Beauregard Cartoon - ‘Gen. Beauregard, and His Lady Love.’” Envelopes. Civil War Collection, 1861. Box 21, Folder 6. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/13331zcsqs-cor.