37. Chronicles of Oklahoma, Vol. 6 #2, June 1928: "Robert M. Harris", an obituary about the late governor by Czarina C. Conlan.
38. History of the State of Oklahoma by L.H. Hill (Vol. 2, pages 168-169). "Governor Robert Maxwell Harris", a biographical sketch on the governor.
An agreement between Cornelius McGee, Joseph Daniels and the government of the United States. re: a claim for $5000 against the government for property taken by Indians, February 16, 1881.