MLA
Sharp, J. M. Letter from J. M. Sharp (Augusta, Georgia) to His Wife, Eliza Sharp - September 11, 1864. 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 19. https://digital.library.emory.edu/purl/962f7m0d5n-cor.
APA, 6th edition
Sharp, J. M. (1864). Letter from J. M. Sharp (Augusta, Georgia) to his wife, Eliza Sharp - September 11, 1864 (Box 6, Folder 19) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/962f7m0d5n-cor.
Chicago
Sharp, J. M. “Letter from J. M. Sharp (Augusta, Georgia) to His Wife, Eliza Sharp - September 11, 1864.” Letters (correspondence). Civil War Collection, 1864. Box 6, Folder 19. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/962f7m0d5n-cor.