MLA
Union Patriotic Envelope - "Camp Harvey, Kenosha, Wisconsin. Libery and Union, Now and Forever.". 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 21, Folder 7. https://digital.library.emory.edu/purl/494vhhmhwb-cor.
APA, 6th edition
Union patriotic envelope - "Camp Harvey, Kenosha, Wisconsin. Libery and Union, Now and Forever." (Box 21, Folder 7). (1861). [Envelopes]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/494vhhmhwb-cor.
Chicago
“Union Patriotic Envelope - ‘Camp Harvey, Kenosha, Wisconsin. Libery and Union, Now and Forever.".” Envelopes. Civil War Collection, 1861. Box 21, Folder 7. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/494vhhmhwb-cor.