The international system : theoretical essays / edited by Klaus Knorr and Sidney Verba. Knorr, Klaus, 1911-1990. Verba, Sidney, 1932- Woodrow Wilson School of Public and International Affairs. Center of International Studies. International relations. International organization. 327 KNI "A revision of papers first presented at a Symposium on International Relations Theory... sponsored by the Center of International Studies and held in Princeton in September 1960". Princeton, N.J. : Princeton University Press, 1967. 1967. 1967 Text 237 p. : eng