MLA
Rogers, J. P. Letter from J. P. Rogers (Rhea County, Tennessee) to "Dear Sister" (North Bend, Alabama) - October 24, 1862. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 2. https://digital.library.emory.edu/purl/354xgxd2v3-cor.
APA, 6th edition
Rogers, J. P. (1862). Letter from J. P. Rogers (Rhea County, Tennessee) to "Dear Sister" (North Bend, Alabama) - October 24, 1862 (Box 6, Folder 2) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/354xgxd2v3-cor.
Chicago
Rogers, J. P. “Letter from J. P. Rogers (Rhea County, Tennessee) to ‘Dear Sister’ (North Bend, Alabama) - October 24, 1862.” Letters (correspondence). Civil War Collection, 1862. Box 6, Folder 2. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/354xgxd2v3-cor.