APA (7e ed.) Bronvermelding
ebrary, Inc. (1994). Assigning economic value to natural resources. National Academy Press.
Chicago (17e ed.) Bronvermelding
ebrary, Inc. Assigning Economic Value to Natural Resources. Washington, D.C.: National Academy Press, 1994.
MLA (9e ed.) Bronvermelding
ebrary, Inc. Assigning Economic Value to Natural Resources. National Academy Press, 1994.
Let op: Deze citaties zijn niet altijd 100% accuraat.