MLA
Hall, Francis M. Letter from Francis M. Hall (Camp Lee near Richmond, Virginia) to "Dear Father" - August 25, 1862 (Typescript). 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 3, Folder 44. https://digital.library.emory.edu/purl/2150gb5nkr-cor.
APA, 6th edition
Hall, F. M. (1862). Letter from Francis M. Hall (Camp Lee near Richmond, Virginia) to "Dear Father" - August 25, 1862 (typescript) (Box 3, Folder 44) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/2150gb5nkr-cor.
Chicago
Hall, Francis M. “Letter from Francis M. Hall (Camp Lee near Richmond, Virginia) to ‘Dear Father’ - August 25, 1862 (Typescript).” Letters (correspondence). Civil War Collection, 1862. Box 3, Folder 44. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/2150gb5nkr-cor.