Levi, W. (1974). International politics: Foundations of the system. University of Minnesota Press.
Citazione stile Chigago Style (17a edizione)Levi, Werner. International Politics: Foundations of the System. Minneapolis: University of Minnesota Press, 1974.
Citatione MLA (9a ed.)Levi, Werner. International Politics: Foundations of the System. University of Minnesota Press, 1974.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.