Boulding, Kenneth E.Conflict and Defense. New York: Harper & Bros., 1962.
2.
Mowrer, O. Hobart.Learning Theory and Behavior. New York: John Wiley & Sons, 1960.
3.
Zinnes, Dina A., North, Robert C. and Koch, Howard E., JR. "Capability, Threat and the Outbreak of War." In James N. Rosenau (ed.), International Politics and Foreign Policy. New York: The Free Press of Glencoe, 1961.