MLA
Gordon, J. J. Letter from J. J. Gordon (Fortress Monroe, Virginia) to His Wife, Jane - December 2, 1861 (Photocopy). 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 19, Folder 29. https://digital.library.emory.edu/purl/378tb2rcs3-cor.
APA, 6th edition
Gordon, J. J. (1861). Letter from J. J. Gordon (Fortress Monroe, Virginia) to his wife, Jane - December 2, 1861 (photocopy) (Box 19, Folder 29) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/378tb2rcs3-cor.
Chicago
Gordon, J. J. “Letter from J. J. Gordon (Fortress Monroe, Virginia) to His Wife, Jane - December 2, 1861 (Photocopy).” Letters (correspondence). Civil War Collection, 1861. Box 19, Folder 29. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/378tb2rcs3-cor.