Levi, W. (1974). International politics: Foundations of the system. University of Minnesota Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLevi, Werner. International Politics: Foundations of the System. Minneapolis: University of Minnesota Press, 1974.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLevi, Werner. International Politics: Foundations of the System. University of Minnesota Press, 1974.
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