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Schuman, F. L. (1958). International politics: The western state system and the world community (6th ed.). New York: McGraw - Hill.

Schuman, Frederick L. International Politics: The Western State System and the World Community. 6th ed. New York: McGraw - Hill, 1958.

Schuman, Frederick L. International Politics: The Western State System and the World Community. 6th ed. New York: McGraw - Hill, 1958.