MLA
Upham, Samuel C. (Samuel Curtis), 1819-1885. Union patriotic envelope with Jefferson Davis cartoon - "Uncle Abe will be glad to see you.", published by S. C. Upham. 1861?/1865?. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/344pk0p3t2-cor.
APA, 6th edition
Upham, Samuel C. (Samuel Curtis), 1819-1885. (1861?/1865?)[Union patriotic envelope with Jefferson Davis cartoon - "Uncle Abe will be glad to see you.", published by S. C. Upham]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/344pk0p3t2-cor.
Chicago
Upham, Samuel C. (Samuel Curtis), 1819-1885, Union patriotic envelope with Jefferson Davis cartoon - "Uncle Abe will be glad to see you.", published by S. C. Upham, 1861?/1865?, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/344pk0p3t2-cor.