Cita APA (7th ed.)
ebrary, Inc. (1994). Assigning economic value to natural resources. National Academy Press.
Cita Chicago (17th ed.)
ebrary, Inc. Assigning Economic Value to Natural Resources. Washington, D.C.: National Academy Press, 1994.
Cita MLA (9th ed.)
ebrary, Inc. Assigning Economic Value to Natural Resources. National Academy Press, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.