MLA
Smith, Francis H. (Francis Henney), 1812-1890. Letter from Francis H. Smith (Lexington, Virginia), Superintendent of the Virginia Military Institute, to J. S. Thorne[?] (New York) - November 2, 1869. November 2, 1869. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7612ngf2ws-cor.
APA, 6th edition
Smith, Francis H. (Francis Henney), 1812-1890. (November 2, 1869)[Letter from Francis H. Smith (Lexington, Virginia), Superintendent of the Virginia Military Institute, to J. S. Thorne[?] (New York) - November 2, 1869]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7612ngf2ws-cor.
Chicago
Smith, Francis H. (Francis Henney), 1812-1890, Letter from Francis H. Smith (Lexington, Virginia), Superintendent of the Virginia Military Institute, to J. S. Thorne[?] (New York) - November 2, 1869, November 2, 1869, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7612ngf2ws-cor.