MLA
Davant, E. J. Letter from E. J. Davant (Sullivan's Island, South Carolina) to "My Dear Friend" - August 9, 1882. 1882. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 2, Folder 46. https://digital.library.emory.edu/purl/7784j0zqdn-cor.
APA, 6th edition
Davant, E. J. (1882). Letter from E. J. Davant (Sullivan's Island, South Carolina) to "My dear friend" - August 9, 1882 (Box 2, Folder 46) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7784j0zqdn-cor.
Chicago
Davant, E. J. “Letter from E. J. Davant (Sullivan's Island, South Carolina) to ‘My Dear Friend’ - August 9, 1882.” Letters (correspondence). Civil War Collection, 1882. Box 2, Folder 46. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7784j0zqdn-cor.