MLA
Ward, Joseph W. Portion of Letter from Joseph W. Ward to [Unknown]. Ward Was an Officer in Company L of the 24th Mississippi Infantry. 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 7, Folder 12. https://digital.library.emory.edu/purl/972p5hqd19-cor.
APA, 6th edition
Ward, J. W. (1861). Portion of letter from Joseph W. Ward to [unknown]. Ward was an officer in Company L of the 24th Mississippi Infantry (Box 7, Folder 12) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/972p5hqd19-cor.
Chicago
Ward, Joseph W. “Portion of Letter from Joseph W. Ward to [Unknown]. Ward Was an Officer in Company L of the 24th Mississippi Infantry.” Letters (correspondence). Civil War Collection, 1861. Box 7, Folder 12. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/972p5hqd19-cor.