MLA
Union Patriotic Envelope with Theodore Winthrop Cartoon - "To Maj. Winthrop, Shot at the Battle of Big Bethel, June 10th, 1861, All That Was Generous and Brave: We Mourn His Loss". 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 21, Folder 6. https://digital.library.emory.edu/purl/402q573pbk-cor.
APA, 6th edition
Union patriotic envelope with Theodore Winthrop cartoon - "To Maj. Winthrop, Shot at the Battle of Big Bethel, June 10th, 1861, All that was generous and brave: We Mourn His Loss" (Box 21, Folder 6). (1861). [Envelopes]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/402q573pbk-cor.
Chicago
“Union Patriotic Envelope with Theodore Winthrop Cartoon - ‘To Maj. Winthrop, Shot at the Battle of Big Bethel, June 10th, 1861, All That Was Generous and Brave: We Mourn His Loss.’” Envelopes. Civil War Collection, 1861. Box 21, Folder 6. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/402q573pbk-cor.