3 Edward Hallett Carr, The Twenty Years’ War: An Introduction to the Study of International Relations, Harper & Row, 1964, p.223, p.213; A.F.K. Organski, World Politics, Second Edition, 1968, Alfred A. Knopf, Inc. Pp.363-377, pp.488-490; Robert Gilpin, War and Change in World Politics, Cambridge University Press, 1981, p.209;