APA (7th ed.) Zitazioa
Levi, W. (1974). International politics: Foundations of the system. University of Minnesota Press.
Chicago Style (17th ed.) Zitazioa
Levi, Werner. International Politics: Foundations of the System. Minneapolis: University of Minnesota Press, 1974.
MLA (9th ed.) Zitazioa
Levi, Werner. International Politics: Foundations of the System. University of Minnesota Press, 1974.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.