MLA
Beasley, James Albert. Letter Written by James Albert Beasley from Atlanta, Georgia Where He Was Attending Medical College - November 22, 1875 (Typescript). 1875. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 24. https://digital.library.emory.edu/purl/8773tx96wf-cor.
APA, 6th edition
Beasley, J. A. (1875). Letter written by James Albert Beasley from Atlanta, Georgia where he was attending medical college - November 22, 1875 (typescript) (Box 1, Folder 24) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8773tx96wf-cor.
Chicago
Beasley, James Albert. “Letter Written by James Albert Beasley from Atlanta, Georgia Where He Was Attending Medical College - November 22, 1875 (Typescript).” Letters (correspondence). Civil War Collection, 1875. Box 1, Folder 24. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8773tx96wf-cor.