Παραπομπή APA

Kaplan, M. A. (1957). System and process in international politics. John Wiley and Sons.

Παραπομπή Chicago Style

Kaplan, Morton A. System and Process in International Politics. New York: John Wiley and Sons, 1957.

Παραπομπή MLA

Kaplan, Morton A. System and Process in International Politics. John Wiley and Sons, 1957.