MLA
McDonald, James A. W. Letter from James A. W. McDonald (Christian County, Kentucky) to "Dear Brother" [Alfred W. Sandlin]. James A. McDonald (Blackwell, Virginia) Served in the 2nd Mississippi Infantry Regiment - October, 1861. 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 11. https://digital.library.emory.edu/purl/9010p2nh5b-cor.
APA, 6th edition
McDonald, J. A. W. (1861). Letter from James A. W. McDonald (Christian County, Kentucky) to "Dear Brother" [Alfred W. Sandlin]. James A. McDonald (Blackwell, Virginia) served in the 2nd Mississippi Infantry Regiment - October, 1861 (Box 6, Folder 11) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9010p2nh5b-cor.
Chicago
McDonald, James A. W. “Letter from James A. W. McDonald (Christian County, Kentucky) to ‘Dear Brother’ [Alfred W. Sandlin]. James A. McDonald (Blackwell, Virginia) Served in the 2nd Mississippi Infantry Regiment - October, 1861.” Letters (correspondence). Civil War Collection, 1861. Box 6, Folder 11. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9010p2nh5b-cor.