MLA
Fellan, J. M. Letter from J. M. Fellan to His Sister (Photocopy). 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 10, Folder 1. https://digital.library.emory.edu/purl/641mgqnmcj-cor.
APA, 6th edition
Fellan, J. M. (1861). Letter from J. M. Fellan to his sister (photocopy) (Box 10, Folder 1) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/641mgqnmcj-cor.
Chicago
Fellan, J. M. “Letter from J. M. Fellan to His Sister (Photocopy).” Letters (correspondence). Civil War Collection, 1861. Box 10, Folder 1. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/641mgqnmcj-cor.