MLA
Wheeler, Fredrick E. Letter from Fredrick E. Wheeler to "My Dear Aunt Carrie" - December 22, 1917 (Photocopy). 1917. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 19, Folder 35. https://digital.library.emory.edu/purl/750tqjq3gv-cor.
APA, 6th edition
Wheeler, F. E. (1917). Letter from Fredrick E. Wheeler to "My dear Aunt Carrie" - December 22, 1917 (photocopy) (Box 19, Folder 35) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/750tqjq3gv-cor.
Chicago
Wheeler, Fredrick E. “Letter from Fredrick E. Wheeler to ‘My Dear Aunt Carrie’ - December 22, 1917 (Photocopy).” Letters (correspondence). Civil War Collection, 1917. Box 19, Folder 35. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/750tqjq3gv-cor.