Trzyna, T. C., & Childers, R. (1992). World directory of environmental organizations: A handbook of national and international organizations and programs - governmental and non-governmental - concerned with protecting the earth's resources (4. ed.). Calif. Inst. of Public Affairs.
Chicago-Zitierstil (17. Ausg.)Trzyna, Thaddeus C., und Roberta Childers. World Directory of Environmental Organizations: A Handbook of National and International Organizations and Programs - Governmental and Non-governmental - Concerned with Protecting the Earth's Resources. 4. ed. Sacramento, Calif: Calif. Inst. of Public Affairs, 1992.
MLA-Zitierstil (9. Ausg.)Trzyna, Thaddeus C., und Roberta Childers. World Directory of Environmental Organizations: A Handbook of National and International Organizations and Programs - Governmental and Non-governmental - Concerned with Protecting the Earth's Resources. 4. ed. Calif. Inst. of Public Affairs, 1992.