National Academy of Engineering. Program Office & Helm, J. L. (1990). Energy: Production, consumption, and consequences. National Academy Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Academy of Engineering. Program Office और John L. Helm. Energy: Production, Consumption, and Consequences. Washington, D.C.: National Academy Press, 1990.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Academy of Engineering. Program Office और John L. Helm. Energy: Production, Consumption, and Consequences. National Academy Press, 1990.
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