MLA
Scales, Alfred M. (Alfred Moore), 1827-1892. Letter from Alfred Moore Scales (Waynesville, North Carolina) to James Longstreet - August 18, 1885 (typescript). August 18, 1885. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/846d2548jd-cor.
APA, 6th edition
Scales, Alfred M. (Alfred Moore), 1827-1892. (August 18, 1885)[Letter from Alfred Moore Scales (Waynesville, North Carolina) to James Longstreet - August 18, 1885 (typescript)]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/846d2548jd-cor.
Chicago
Scales, Alfred M. (Alfred Moore), 1827-1892, Letter from Alfred Moore Scales (Waynesville, North Carolina) to James Longstreet - August 18, 1885 (typescript), August 18, 1885, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/846d2548jd-cor.