MLA
Chapman, S. M. Letter from S. M Chapman (Tybee Island, Georgia) to His Wife. Chapman Was a Member of Captain G.T. Dunham's Company at Fort Pulaski, Georgia - November 6, 1861 (Photocopy). 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 2, Folder 14. https://digital.library.emory.edu/purl/13331zcsjj-cor.
APA, 6th edition
Chapman, S. M. (1861). Letter from S. M Chapman (Tybee Island, Georgia) to his wife. Chapman was a member of Captain G.T. Dunham's Company at Fort Pulaski, Georgia - November 6, 1861 (photocopy) (Box 2, Folder 14) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/13331zcsjj-cor.
Chicago
Chapman, S. M. “Letter from S. M Chapman (Tybee Island, Georgia) to His Wife. Chapman Was a Member of Captain G.T. Dunham's Company at Fort Pulaski, Georgia - November 6, 1861 (Photocopy).” Letters (correspondence). Civil War Collection, 1861. Box 2, Folder 14. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/13331zcsjj-cor.