MLA
Davies, Fred L. Letter from Fred L. Davies (Chimborazo Hospital, Richmond, Virginia), to "Dear Doctor" - July 21, 1864. 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 2, Folder 49. https://digital.library.emory.edu/purl/774qjq2cv8-cor.
APA, 6th edition
Davies, F. L. (1864). Letter from Fred L. Davies (Chimborazo Hospital, Richmond, Virginia), to "Dear Doctor" - July 21, 1864 (Box 2, Folder 49) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/774qjq2cv8-cor.
Chicago
Davies, Fred L. “Letter from Fred L. Davies (Chimborazo Hospital, Richmond, Virginia), to ‘Dear Doctor’ - July 21, 1864.” Letters (correspondence). Civil War Collection, 1864. Box 2, Folder 49. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/774qjq2cv8-cor.