MLA
Chambers, S. S. Letter from S. S. Chambers (Line of Battle 4 Miles South of Marietta, Georgia) to "Uncle Joe, Aunt Sallie, and Family" - July 4, 1864. 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 2, Folder 11. https://digital.library.emory.edu/purl/470zpc878c-cor.
APA, 6th edition
Chambers, S. S. (1864). Letter from S. S. Chambers (line of battle 4 miles south of Marietta, Georgia) to "Uncle Joe, Aunt Sallie, and family" - July 4, 1864 (Box 2, Folder 11) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/470zpc878c-cor.
Chicago
Chambers, S. S. “Letter from S. S. Chambers (Line of Battle 4 Miles South of Marietta, Georgia) to ‘Uncle Joe, Aunt Sallie, and Family’ - July 4, 1864.” Letters (correspondence). Civil War Collection, 1864. Box 2, Folder 11. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/470zpc878c-cor.