1. Protecting the environment with the power of the market;Alper;Science,1993
2. Prodigious Birds: Moas and moahunting in prehistoric New Zealand;Anderson,1990
3. Environmental Ethics: Divergence and convergence,1993
4. Why Do We still Have an Ecological Crisis?;Armstrong,1972
5. Balancing economic needs with environmental concerns: What factors guide individual action?;Axelrod;Journal of Social Issues,1994