Lexington, MA, Lexington Books, 1988. The Change from Firepower to Knowledge Power, by Alan D. Campen, pp183-186. Book call no. Alexandria, VA, Time-Life, 1991.
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Englewood Cliffs, NJ, Prentice Hall, 1994. Book call no. Airpower Research Institute. Fundamentals and Interactions , by George E. Orr. Maxwell AFB, AL, Air University Press, 1983.