MLA
Union Patriotic Envelopes Dealing with Secession - Devil Blowing out a Glass Object Bearing the Words "SECESSION". Near the Devil Is an Object Bearing the Words "TREASON". 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 21, Folder 8. https://digital.library.emory.edu/purl/402q573pbm-cor.
APA, 6th edition
Union patriotic envelopes dealing with secession - Devil blowing out a glass object bearing the words "SECESSION". Near the Devil is an object bearing the words "TREASON" (Box 21, Folder 8). (1861). [Envelopes]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/402q573pbm-cor.
Chicago
“Union Patriotic Envelopes Dealing with Secession - Devil Blowing out a Glass Object Bearing the Words ‘SECESSION’. Near the Devil Is an Object Bearing the Words ‘TREASON.’” Envelopes. Civil War Collection, 1861. Box 21, Folder 8. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/402q573pbm-cor.