APA (7th ed.) Citation

United Nations. Economic Commission for Europe. (1991). Policies and systems of environmental impact assessment. United Nations.

Chicago Style (17th ed.) Citation

United Nations. Economic Commission for Europe. Policies and Systems of Environmental Impact Assessment. New York: United Nations, 1991.

MLA (9th ed.) Citation

United Nations. Economic Commission for Europe. Policies and Systems of Environmental Impact Assessment. United Nations, 1991.

Warning: These citations may not always be 100% accurate.