National Academy of Engineering. Program Office & Helm, J. L. (1990). Energy: Production, consumption, and consequences. National Academy Press.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)National Academy of Engineering. Program Office ба John L. Helm. Energy: Production, Consumption, and Consequences. Washington, D.C.: National Academy Press, 1990.
MLA -ийн эшлэл (9 дэх хэвлэлт)National Academy of Engineering. Program Office ба John L. Helm. Energy: Production, Consumption, and Consequences. National Academy Press, 1990.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.