Ikenberry, G. J. (1988). Reasons of State: Oil Politics and the Capacities of American Government. Cornell University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रIkenberry, G. John. Reasons of State: Oil Politics and the Capacities of American Government. Ithaca: Cornell University Press, 1988.
एमएलए (9वां संस्करण) प्रशस्ति पत्रIkenberry, G. John. Reasons of State: Oil Politics and the Capacities of American Government. Cornell University Press, 1988.
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