↑ Kenneth E. Boulding (1962). Conflict and Defense: A General Theory. New York: Harper. tr. 262.
↑ Kenneth E. Boulding (1964). The Meaning of the Twentieth Century: The Great Transition. London: George Allen & Unwin. tr. 87.
↑ Webb, Kieran (2007). “The Continued Importance of Geographic Distance and Boulding's Loss of Strength Gradient”. Comparative Strategy 26 (4): 295–310. doi:10.1080/01495930701598607.
