MLA
McDonald, James A. W. Letter from James A. W. McDonald (Blackwell, Virginia) to Lucinda E. Sandlin (Mooreville, Mississippi). James A. McDonald Served in the 2nd Mississippi Infantry Regiment - March 15, 1865. 1865. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 11. https://digital.library.emory.edu/purl/433dz08mds-cor.
APA, 6th edition
McDonald, J. A. W. (1865). Letter from James A. W. McDonald (Blackwell, Virginia) to Lucinda E. Sandlin (Mooreville, Mississippi). James A. McDonald served in the 2nd Mississippi Infantry Regiment - March 15, 1865 (Box 6, Folder 11) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/433dz08mds-cor.
Chicago
McDonald, James A. W. “Letter from James A. W. McDonald (Blackwell, Virginia) to Lucinda E. Sandlin (Mooreville, Mississippi). James A. McDonald Served in the 2nd Mississippi Infantry Regiment - March 15, 1865.” Letters (correspondence). Civil War Collection, 1865. Box 6, Folder 11. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/433dz08mds-cor.