Calloway, Colin G. The Vermont Secretary and the Apache POWs: Redfield Proctor and the Case of the Chiricahuas. Vermont History 59 (Summer 1991): 166-79.
Cooley, Roger G. Redfield Proctor: A Study in LeadershipThe Vermont Period. Ph.D. dissertation, University of Rochester, 1955.
Davis, Michelle Bray, and Rollin W. Quimby. Senator Proctors Cuban Speech: Speculations on a Cause of the Spanish-American War. Quarterly Journal of Speech 55 (April 1969): 131-41.
Partridge, Frank C. Redfield Proctor, His Life and Public Services. Proceedings of the Vermont Historical Society for the Years 1913-1914 (1915): 57-123.
U.S. Congress. Redfield Proctor (Late a Senator from Vermont): Memorial Addresses. 60th Cong., 2d sess., 1908-1909. Washington: Government Printing Office, 1909.