1. EEA (European Environment Agency), 1995. Europe's Environment: the Dobris Assessment, EEA, Copenhagen.
2. EEA (European Environment Agency), 1998. Europe's Environment: the Second Assessment, Office for Official Publications of the European Communities, Luxembourg.
3. EEA (European Environment Agency), 1999. Environment in the European Union at the Turn of the Century, Environmental Assessment Report No. 2, EEA, Copenhagen.
4. Valuing Nature: Economics, Ethics and Environment,1997
5. New Scarcity and Economic Growth;Hueting,1980