MLA
Sharp, J. M. Letter from J. M. Sharp (Meridian, Mississippi) to His Wife, Eliza Sharp - January 24, 1865. 1865. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 19. https://digital.library.emory.edu/purl/52908kpsfx-cor.
APA, 6th edition
Sharp, J. M. (1865). Letter from J. M. Sharp (Meridian, Mississippi) to his wife, Eliza Sharp - January 24, 1865 (Box 6, Folder 19) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52908kpsfx-cor.
Chicago
Sharp, J. M. “Letter from J. M. Sharp (Meridian, Mississippi) to His Wife, Eliza Sharp - January 24, 1865.” Letters (correspondence). Civil War Collection, 1865. Box 6, Folder 19. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52908kpsfx-cor.