APA (7e ed.) Bronvermelding
ebrary, Inc, & Helm, J. L. (1990). Energy: Production, consumption, and consequences. National Academy Press.
Chicago (17e ed.) Bronvermelding
ebrary, Inc, en John L. Helm. Energy: Production, Consumption, and Consequences. Washington, D.C.: National Academy Press, 1990.
MLA (9e ed.) Bronvermelding
ebrary, Inc, en John L. Helm. Energy: Production, Consumption, and Consequences. National Academy Press, 1990.
Let op: Deze citaties zijn niet altijd 100% accuraat.