1. Oil Weekly, April 24, 1931;
2. Oil and Gas Journal, August. 4, September. 9, and October. 6, 1938.
3. Oil and Gas Journal, March. 17, 1958;
4. The Petroleum Industry in Transition: Antitrust and the Decline of Monopoly Control in Oil;Pratt;JOURNAL,1980
5. Murphy, Conservation of Oil and Gas, pp. 92–120, outlines conditions in Illinois. Fear of federal intervention helped to persuade Illinois firms to support stricter state prorationing legislation.