MLA
Canton, James H. C. Letter from James H. C. Canton (Jackson, Mississippi) to "Dear Wife" - February 12, 1865. 1865. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 2, Folder 6. https://digital.library.emory.edu/purl/4881jwsvpg-cor.
APA, 6th edition
Canton, J. H. C. (1865). Letter from James H. C. Canton (Jackson, Mississippi) to "Dear wife" - February 12, 1865 (Box 2, Folder 6) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4881jwsvpg-cor.
Chicago
Canton, James H. C. “Letter from James H. C. Canton (Jackson, Mississippi) to ‘Dear Wife’ - February 12, 1865.” Letters (correspondence). Civil War Collection, 1865. Box 2, Folder 6. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4881jwsvpg-cor.