MLA
Harris, E. M. Letter from E. M. Harris (Madison, Georgia) to Vason & Davis (Albany, Georgia) - March 9, 1864. 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 3, Folder 52. https://digital.library.emory.edu/purl/97634tmqdc-cor.
APA, 6th edition
Harris, E. M. (1864). Letter from E. M. Harris (Madison, Georgia) to Vason & Davis (Albany, Georgia) - March 9, 1864 (Box 3, Folder 52) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/97634tmqdc-cor.
Chicago
Harris, E. M. “Letter from E. M. Harris (Madison, Georgia) to Vason & Davis (Albany, Georgia) - March 9, 1864.” Letters (correspondence). Civil War Collection, 1864. Box 3, Folder 52. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/97634tmqdc-cor.