MLA
Stewart, F. M. Letter from F. M. Stewart (Headquarters of the 15th Tennessee Cavalry, Oxford, Alabama) to Lieutenant E. S. Hammond - June 28, 1864 (Typescript). 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 44. https://digital.library.emory.edu/purl/0106wwq059-cor.
APA, 6th edition
Stewart, F. M. (1864). Letter from F. M. Stewart (Headquarters of the 15th Tennessee Cavalry, Oxford, Alabama) to Lieutenant E. S. Hammond - June 28, 1864 (typescript) (Box 6, Folder 44) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0106wwq059-cor.
Chicago
Stewart, F. M. “Letter from F. M. Stewart (Headquarters of the 15th Tennessee Cavalry, Oxford, Alabama) to Lieutenant E. S. Hammond - June 28, 1864 (Typescript).” Letters (correspondence). Civil War Collection, 1864. Box 6, Folder 44. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0106wwq059-cor.