MLA
Strawn, J. Donald. Letter from J. Donald Strawn (Benton Barracks, Missouri) to His Parents. Strawn Was Born in Salem, Ohio, and Served in the 101st Illinois Infantry Regiment, Company I - May 5, 1863 (Typescript). 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 20, Folder 29. https://digital.library.emory.edu/purl/3074tmph9r-cor.
APA, 6th edition
Strawn, J. D. (1863). Letter from J. Donald Strawn (Benton Barracks, Missouri) to his parents. Strawn was born in Salem, Ohio, and served in the 101st Illinois Infantry Regiment, Company I - May 5, 1863 (typescript) (Box 20, Folder 29) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3074tmph9r-cor.
Chicago
Strawn, J. Donald. “Letter from J. Donald Strawn (Benton Barracks, Missouri) to His Parents. Strawn Was Born in Salem, Ohio, and Served in the 101st Illinois Infantry Regiment, Company I - May 5, 1863 (Typescript).” Letters (correspondence). Civil War Collection, 1863. Box 20, Folder 29. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3074tmph9r-cor.