(en) Henrietta Melia Larson et Kenneth Wiggins Porter, History of Humble Oil & Refining Company, Ayer Company Pub, , 769p. (ISBN978-0-405-08083-8 et 0405080832)
(en) Diana Davids Olien et Roger M. Olien, Oil in Texas: the gusher age, 1895 - 1945, Austin, University of Texas Press, (ISBN0-292-76056-6, OCLC248169455).
(en) Ross S. Sterling et Ed Kilman, Ross Sterling, Texan: A Memoir by the Founder of Humble Oil and Refining Company, University of Texas Press, , 280p. (ISBN978-0-292-77347-9 et 0292773471, lire en ligne).