Dyfyniad APA

National Academy of Engineering. Program Office & Helm, J. L. (1990). Energy: Production, consumption, and consequences. National Academy Press.

Dyfyniad Arddull Chicago

National Academy of Engineering. Program Office and John L. Helm. Energy: Production, Consumption, and Consequences. Washington, D.C.: National Academy Press, 1990.

Dyfyniad MLA

National Academy of Engineering. Program Office and John L. Helm. Energy: Production, Consumption, and Consequences. National Academy Press, 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.