United Nations. Economic Commission for Europe. (2004). Strategies and policies for air pollution abatement. United Nations.
芝加哥风格引文United Nations. Economic Commission for Europe. Strategies and Policies for Air Pollution Abatement. New York: United Nations, 2004.
MLA引文United Nations. Economic Commission for Europe. Strategies and Policies for Air Pollution Abatement. United Nations, 2004.
警告：这些引文格式不一定是100％准确.