MLA
Brown, and Ryan. Union Patriotic Envelopes - "Behold the Man! He Said That COTTON Would Surely Make Them Inde-Pendant! But See, My Friend, 'the String He's Got on,' A Fit Adornment to the End on't" Published by Brown & Ryan. Brown & Ryan, 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 21, Folder 9. https://digital.library.emory.edu/purl/52908kpt03-cor.
APA, 6th edition
B., & R. (1861). Union patriotic envelopes - "Behold the man! He said that COTTON would surely make them inde-pendant! But see, my friend, 'the string he's got on,' A fit adornment to the end on't" Published by Brown & Ryan (Box 21, Folder 9) [Envelopes]. Brown & Ryan; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52908kpt03-cor.
Chicago
Brown, and Ryan. “Union Patriotic Envelopes - ‘Behold the Man! He Said That COTTON Would Surely Make Them Inde-Pendant! But See, My Friend, 'the String He's Got on,' A Fit Adornment to the End on't’ Published by Brown & Ryan.” Envelopes. Civil War Collection. New York City, NY: Brown & Ryan, 1861. Box 21, Folder 9. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52908kpt03-cor.