MLA
Letter from [Unidentified] (Charleston, South Carolina) to M. R. Tunno - November 3, 1862. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 57. https://digital.library.emory.edu/purl/317crjdgb9-cor.
APA, 6th edition
Letter from [unidentified] (Charleston, South Carolina) to M. R. Tunno - November 3, 1862 (Box 6, Folder 57). (1862). [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/317crjdgb9-cor.
Chicago
“Letter from [Unidentified] (Charleston, South Carolina) to M. R. Tunno - November 3, 1862.” Letters (correspondence). Civil War Collection, 1862. Box 6, Folder 57. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/317crjdgb9-cor.