MLA
Boutwell, George S. (George Sewall), 1818-1905. Letter from George S. Boutwell to William H. Scott, Sr., September 13, 1904. September 13, 1904. William H. Scott Family Papers, 1848-1982. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/672b8gtkbm-cor.
APA, 6th edition
Boutwell, George S. (George Sewall), 1818-1905. (September 13, 1904)[Letter from George S. Boutwell to William H. Scott, Sr., September 13, 1904]. William H. Scott Family Papers, 1848-1982, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/672b8gtkbm-cor.
Chicago
Boutwell, George S. (George Sewall), 1818-1905, Letter from George S. Boutwell to William H. Scott, Sr., September 13, 1904, September 13, 1904, William H. Scott Family Papers, 1848-1982, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/672b8gtkbm-cor.