Lettow, P. V. (2010). Strengthening the nuclear nonproliferation regime. Council on Foreign Relations.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLettow, Paul Vorbeck. Strengthening the Nuclear Nonproliferation Regime. New York: Council on Foreign Relations, 2010.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLettow, Paul Vorbeck. Strengthening the Nuclear Nonproliferation Regime. Council on Foreign Relations, 2010.
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