Freeman, A. M. (2003). Measurement of environmental and resource values: Theory and methods. Resources for the Future.
Chicago-Zitierstil (17. Ausg.)Freeman, A. Myrick. Measurement of Environmental and Resource Values: Theory and Methods. Washington, DC: Resources for the Future, 2003.
MLA-Zitierstil (9. Ausg.)Freeman, A. Myrick. Measurement of Environmental and Resource Values: Theory and Methods. Resources for the Future, 2003.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.