MLA
Huies, Tom. Letter from Tom Huies (Camp Rogers, Mississippi[?]) to "My Dear Uncle" - October 14, 1863. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 23, Folder 37. https://digital.library.emory.edu/purl/856n02v89g-cor.
APA, 6th edition
Huies, T. (1863). Letter from Tom Huies (Camp Rogers, Mississippi[?]) to "My Dear Uncle" - October 14, 1863 (Box 23, Folder 37) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/856n02v89g-cor.
Chicago
Huies, Tom. “Letter from Tom Huies (Camp Rogers, Mississippi[?]) to ‘My Dear Uncle’ - October 14, 1863.” Letters (correspondence). Civil War Collection, 1863. Box 23, Folder 37. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/856n02v89g-cor.