Cockrell, Thomas D. United States Senators and Representatives from Mississippi, 1828-1836: An Introduction. Journal of Mississippi History 49 (February 1987): 35-48.
Dodd, William Edward. Robert J. Walker, Imperialist. 1914. Reprint. Gloucester, MA: Peter Smith, 1967.
Harmon, George D. President James Buchanans Betrayal of Governor Robert J. Walker of Kansas. Pennsylvania Magazine of History and Biography 53 (January 1929): 51-91.
Hartnett, Stephen. Senator Robert Walkers 1844 Letter on Texas Annexation: The Rhetorical Logic of Imperialism." American Studies 38 (Spring 1997): 27-54.
Jordan, H. Donaldson. A Politician of Expansion: Robert J. Walker. Mississippi Valley Historical Review 19 (December 1932): 362-81.
Leftwich, George J. Robert J. Walker. Publications of the Mississippi Historical Society 6 (1902): 359-71.
Shenton, James Patrick. Robert John Walker: A Politician from Jackson to Lincoln. New York: Columbia University Press, 1961.
Tick, Frank H. The Political and Economic Policies of Robert J. Walker. Ph.D. dissertation, University of California, Los Angeles, 1947.