APA Style

Wittkopf, E, R., Kegley, C, W. (1989.). World Politics : trend and transformation. (3rd ed.). New York.: St. Martin\' s Press..

MLA Style

Wittkopf, Eugene, R.., Kegley, Chales, W.. "World Politics : trend and transformation.". 3rd ed. New York.: St. Martin\' s Press., 1989.. หนังสือ (Book).