MLA
Jones, Lewis J. Letter from Lewis L. Jones (Kentucky[?]) to His Wife, Anna. Jones' Home Was in Morgan County, Tennessee, and He Served in the 1st Tennessee Infantry Regiment (Union) - March 18, 1863. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 19, Folder 40. https://digital.library.emory.edu/purl/12683bk4nn-cor.
APA, 6th edition
Jones, L. J. (1863). Letter from Lewis L. Jones (Kentucky[?]) to his wife, Anna. Jones' home was in Morgan County, Tennessee, and he served in the 1st Tennessee Infantry Regiment (Union) - March 18, 1863 (Box 19, Folder 40) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/12683bk4nn-cor.
Chicago
Jones, Lewis J. “Letter from Lewis L. Jones (Kentucky[?]) to His Wife, Anna. Jones' Home Was in Morgan County, Tennessee, and He Served in the 1st Tennessee Infantry Regiment (Union) - March 18, 1863.” Letters (correspondence). Civil War Collection, 1863. Box 19, Folder 40. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/12683bk4nn-cor.