MLA
Binion, James. Letter from James Binion (College Hospital, Williamsburg, Virginia) to "Dear Sister." James Served with the 10th Georgia Regiment, Company F - April 17, 1862. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 29. https://digital.library.emory.edu/purl/583kwh71rz-cor.
APA, 6th edition
Binion, J. (1862). Letter from James Binion (College Hospital, Williamsburg, Virginia) to "Dear Sister." James served with the 10th Georgia Regiment, Company F - April 17, 1862 (Box 1, Folder 29) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/583kwh71rz-cor.
Chicago
Binion, James. “Letter from James Binion (College Hospital, Williamsburg, Virginia) to ‘Dear Sister." James Served with the 10th Georgia Regiment, Company F - April 17, 1862.” Letters (correspondence). Civil War Collection, 1862. Box 1, Folder 29. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/583kwh71rz-cor.