MLA
Lee, Stephen Dill. Contemporary Copy of Official Report from Stephen Dill Lee (Columbia, Mississippi) to A. P. Mason. A Report of Operations at Palmetto Station, Georgia - September 29, 1864. 1865. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 4, Folder 42. https://digital.library.emory.edu/purl/501pg4f5sd-cor.
APA, 6th edition
Lee, S. D. (1865). Contemporary copy of official report from Stephen Dill Lee (Columbia, Mississippi) to A. P. Mason. A report of operations at Palmetto Station, Georgia - September 29, 1864 (Box 4, Folder 42) [Reports]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/501pg4f5sd-cor.
Chicago
Lee, Stephen Dill. “Contemporary Copy of Official Report from Stephen Dill Lee (Columbia, Mississippi) to A. P. Mason. A Report of Operations at Palmetto Station, Georgia - September 29, 1864.” Reports. Civil War Collection, 1865. Box 4, Folder 42. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/501pg4f5sd-cor.