MLA
Binion, James. Letter from James Binion to "Dear Sister." James Served with the 10th Georgia Regiment, Company F. 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 29. https://digital.library.emory.edu/purl/344pk0p3nf-cor.
APA, 6th edition
Binion, J. (1861). Letter from James Binion to "Dear Sister." James served with the 10th Georgia Regiment, Company F (Box 1, Folder 29) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/344pk0p3nf-cor.
Chicago
Binion, James. “Letter from James Binion to ‘Dear Sister." James Served with the 10th Georgia Regiment, Company F.” Letters (correspondence). Civil War Collection, 1861. Box 1, Folder 29. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/344pk0p3nf-cor.