Gilbert Monell Hitchcock Papers 1910-1935, Library of Congress, Manuscript Division, Washington, DC
Gilbert Monell Hitchcock Papers: 1894-1936. Nebraska State Historical Society Lincoln, NE
Berberet, William G.
Nebraska and the League of Nations: An inquiry into the political activities of Senators Gilbert M. Hitchcock and George W. Norris.
Lincoln, Neb.: Berberet, 1965
Coletta, Paolo E.
“The Patronage Battle Between Bryan and Hitchcock.” Nebraska History 49 (Summer 1968): 121-37.
Patterson, R. F.
Gilbert M. Hitchcock, A story of two careers. 1940
Ryley, Thomas W.
Gilbert Hitchcock of Nebraska: Wilson’s floor leader in the fight for the Versailles Treaty.
Lewiston, N.Y.: Edwin Mellen Press, 1998
Robinson, Lawrence Spencer
Internationalism and isolationism between the wars: an opinion survey focusing on George Horace Lorimer, Gilbert M.
Hitchcock and the World-Herald, and the correspondence of Cordell Hull. 1996
Wimer, Kurt
“Senator Hitchcock and the League of Nations.” Nebraska History 44 (September 1963): 189-204.