MLA
Edmonds, William M. Letter from William M. Edmonds to His Brother and Sister, Mr. and Mrs. Preston. Edmonds Served in the 9th Arkansas Infantry Regiment - February 14, 1862. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 3, Folder 17. https://digital.library.emory.edu/purl/969866t2k4-cor.
APA, 6th edition
Edmonds, W. M. (1862). Letter from William M. Edmonds to his brother and sister, Mr. and Mrs. Preston. Edmonds served in the 9th Arkansas Infantry Regiment - February 14, 1862 (Box 3, Folder 17) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/969866t2k4-cor.
Chicago
Edmonds, William M. “Letter from William M. Edmonds to His Brother and Sister, Mr. and Mrs. Preston. Edmonds Served in the 9th Arkansas Infantry Regiment - February 14, 1862.” Letters (correspondence). Civil War Collection, 1862. Box 3, Folder 17. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/969866t2k4-cor.