World Resources Institute & United Nations Environment Programme. (1986). World resources. World Resources Institute.
芝加哥风格引文World Resources Institute 与 United Nations Environment Programme. World Resources. Washington, D.C.: World Resources Institute, 1986.
MLA引文World Resources Institute 与 United Nations Environment Programme. World Resources. World Resources Institute, 1986.
警告：这些引文格式不一定是100％准确.