1. Biosphere 2: The Human Experiment;Allen,1991
2. Managing Environmental Issues: A Casebook;Buchholz,1992
3. The Valdez Principles;CERES (Coalition for Environmentally Responsible Economies),1989
4. Environmental Education: A Statement for Business Management;Corporate Conservation Council,1991
5. Environmental Protection Agency, Environmental Investments: The Cost of a Clean Environment,1990