MLA
Letter from "Your Grateful Kinsfolk" (Henderson County, North Carolina) to an Unknown Recipient - December 31, 1864. 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 4, Folder 25. https://digital.library.emory.edu/purl/037hqbzmjg-cor.
APA, 6th edition
Letter from "your grateful kinsfolk" (Henderson County, North Carolina) to an unknown recipient - December 31, 1864 (Box 4, Folder 25). (1864). [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/037hqbzmjg-cor.
Chicago
“Letter from ‘Your Grateful Kinsfolk’ (Henderson County, North Carolina) to an Unknown Recipient - December 31, 1864.” Letters (correspondence). Civil War Collection, 1864. Box 4, Folder 25. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/037hqbzmjg-cor.