MLA
Bryan, J. M. Letter from J. M. Bryan to Thomas J. Wiley's Wife Telling Her of Her Husband's Death. Wiley Was a Private in the 42nd Georgia Infantry Regiment from Newton County, Georgia - May 6, 1863. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 7, Folder 24. https://digital.library.emory.edu/purl/9182jm650z-cor.
APA, 6th edition
Bryan, J. M. (1863). Letter from J. M. Bryan to Thomas J. Wiley's wife telling her of her husband's death. Wiley was a private in the 42nd Georgia Infantry Regiment from Newton County, Georgia - May 6, 1863 (Box 7, Folder 24) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9182jm650z-cor.
Chicago
Bryan, J. M. “Letter from J. M. Bryan to Thomas J. Wiley's Wife Telling Her of Her Husband's Death. Wiley Was a Private in the 42nd Georgia Infantry Regiment from Newton County, Georgia - May 6, 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/9182jm650z-cor.