MLA
Mason, J. B. Letter from J. B. Mason to Susan A. Kenny. Mason Served in the 9th, Then 58th Alabama Infantry Regiment - January 2, 1864 (Typescript). 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 4, Folder 28. https://digital.library.emory.edu/purl/000000010s-cor.
APA, 6th edition
Mason, J. B. (1864). Letter from J. B. Mason to Susan A. Kenny. Mason served in the 9th, then 58th Alabama Infantry Regiment - January 2, 1864 (typescript) (Box 4, Folder 28) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/000000010s-cor.
Chicago
Mason, J. B. “Letter from J. B. Mason to Susan A. Kenny. Mason Served in the 9th, Then 58th Alabama Infantry Regiment - January 2, 1864 (Typescript).” Letters (correspondence). Civil War Collection, 1864. Box 4, Folder 28. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/000000010s-cor.