MLA
Wiley, Thomas J. Letter from Thomas J. Wiley to His Mother about the Conditions at Vicksburg, Mississippi. Wiley Was a Private in the 42nd Georgia Infantry Regiment from Newton County, Georgia - March 19, 1863. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 7, Folder 24. https://digital.library.emory.edu/purl/7719kd52dv-cor.
APA, 6th edition
Wiley, T. J. (1863). Letter from Thomas J. Wiley to his mother about the conditions at Vicksburg, Mississippi. Wiley was a private in the 42nd Georgia Infantry Regiment from Newton County, Georgia - March 19, 1863 (Box 7, Folder 24) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7719kd52dv-cor.
Chicago
Wiley, Thomas J. “Letter from Thomas J. Wiley to His Mother about the Conditions at Vicksburg, Mississippi. Wiley Was a Private in the 42nd Georgia Infantry Regiment from Newton County, Georgia - March 19, 1863.” Letters (correspondence). Civil War Collection, 1863. Box 7, Folder 24. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7719kd52dv-cor.