1. Schwiebert, E. G., A History of the U.S. Air Force Ballistic Missiles, 1st ed.Praeger, New York, 1964, pp.32, 48.
2. Neufeld, J., TheDevelopment of Ballistic Missiles in the United States Air Force, 1945-1960, Office of Air Force History,U.S.Air Force, Washington,DC, 1990, pp.12-30.