MLA
Letter from an Unknown Soldier (Chattanooga, Tennessee), to "Dear Cosin" - August 17, 1862. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 68. https://digital.library.emory.edu/purl/194hmgqp8h-cor.
APA, 6th edition
Letter from an unknown soldier (Chattanooga, Tennessee), to "Dear Cosin" - August 17, 1862 (Box 6, Folder 68). (1862). [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/194hmgqp8h-cor.
Chicago
“Letter from an Unknown Soldier (Chattanooga, Tennessee), to ‘Dear Cosin’ - August 17, 1862.” Letters (correspondence). Civil War Collection, 1862. Box 6, Folder 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/194hmgqp8h-cor.