MLA
Mickle, William English, 1846-1920. Letter from William E. Mickle to his father; Joseph Thomas Mickle (Summerville Institute, Cholson, Mississippi). William served in the 3rd Alabama Regiment - January 27, 1864. January 27, 1864. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4644qrfk8p-cor.
APA, 6th edition
Mickle, William English, 1846-1920. (January 27, 1864)[Letter from William E. Mickle to his father; Joseph Thomas Mickle (Summerville Institute, Cholson, Mississippi). William served in the 3rd Alabama Regiment - January 27, 1864]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4644qrfk8p-cor.
Chicago
Mickle, William English, 1846-1920, Letter from William E. Mickle to his father; Joseph Thomas Mickle (Summerville Institute, Cholson, Mississippi). William served in the 3rd Alabama Regiment - January 27, 1864, January 27, 1864, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4644qrfk8p-cor.