United Nations. Department of Economic and Social Affairs. (2007). World economic and social survey 2007: Development in an ageing world. United Nations.
芝加哥风格引文United Nations. Department of Economic and Social Affairs. World Economic and Social Survey 2007: Development in an Ageing World. New York: United Nations, 2007.
MLA引文United Nations. Department of Economic and Social Affairs. World Economic and Social Survey 2007: Development in an Ageing World. United Nations, 2007.
警告：这些引文格式不一定是100％准确.