Bibliografía (12 obras)
Sustainable Values, Sustainable Change
2015
Sustainability
2005
Searching for Sustainability
2002
Wolves and human communities
2000
Ethics on the ark
1995
Ecosystem health
1992
Toward unity among environmentalists
1991
Why preserve natural variety?
1987
The Preservation of species
1986
The Preservation of Species
Linguistic frameworks and ontology
1977
Ethics on the Ark
