MLA
Cleveland, Henry M. Letter to William Berrien Burroughs from Henry M. Cleveland, "Col. of President Jefferson Davis's Staff, Secret Service" - March 16, 1896. 1896. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 46. https://digital.library.emory.edu/purl/924wh70szv-cor.
APA, 6th edition
Cleveland, H. M. (1896). Letter to William Berrien Burroughs from Henry M. Cleveland, "Col. of President Jefferson Davis's Staff, Secret Service" - March 16, 1896 (Box 1, Folder 46) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/924wh70szv-cor.
Chicago
Cleveland, Henry M. “Letter to William Berrien Burroughs from Henry M. Cleveland, ‘Col. of President Jefferson Davis's Staff, Secret Service’ - March 16, 1896.” Letters (correspondence). Civil War Collection, 1896. Box 1, Folder 46. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/924wh70szv-cor.