MLA
Notes Regarding Provenance of Three Letters Written by Robert E. Lee to James Longstreet (Typescript). 1939. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 4, Folder 50. https://digital.library.emory.edu/purl/9117m0cgzz-cor.
APA, 6th edition
Notes regarding provenance of three letters written by Robert E. Lee to James Longstreet (typescript) (Box 4, Folder 50). (1939). [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9117m0cgzz-cor.
Chicago
“Notes Regarding Provenance of Three Letters Written by Robert E. Lee to James Longstreet (Typescript).” Letters (correspondence). Civil War Collection, 1939. Box 4, Folder 50. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9117m0cgzz-cor.