Charles Sumner collection 1840-1874 (bulk 1852-1874)
Additional Descriptive Data
The William L. Clements Library has a variety of additional materials related to Charles Sumner.
Elliot C. Cowdin compiled the Anson Burlingame collection.
Blue, Frederick J. "Sumner, Charles." American National Biography Online. Oxford University Press, 2000. DOI: 04-00969.
"Sumner, Charles." Biographical Directory of the United States Congress. Online edition. 2012.