National Academy of Engineering. Program Office & Helm, J. L. (1990). Energy: Production, consumption, and consequences. National Academy Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Academy of Engineering. Program Office و John L. Helm. Energy: Production, Consumption, and Consequences. Washington, D.C.: National Academy Press, 1990.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)National Academy of Engineering. Program Office و John L. Helm. Energy: Production, Consumption, and Consequences. National Academy Press, 1990.