APA Style

Wittkopf, E, R., Kegley, C, W. (1981.). World politics : Trend and Transformation / Eugene R. Wittkopf and Charkes W. Kegley (1). New York.: St. Martin\' s Press..

MLA Style

Wittkopf, Eugene, R.., Kegley, Charkes, W.. "World politics : Trend and Transformation / Eugene R. Wittkopf and Charkes W. Kegley". 1 New York.: St. Martin\' s Press., 1981.. หนังสือ (Book).