Cressey. Careers in International Affairs. Georgetown University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCressey. Careers in International Affairs. Georgetown University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCressey. Careers in International Affairs. Georgetown University Press.
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