United Nations. Department for Economic and Social Information and Policy Analysis. (1993). Population growth and policies in mega-cities. Sao Paulo. United Nations.
芝加哥风格引文United Nations. Department for Economic and Social Information and Policy Analysis. Population Growth and Policies in Mega-cities. Sao Paulo. New York: United Nations, 1993.
MLA引文United Nations. Department for Economic and Social Information and Policy Analysis. Population Growth and Policies in Mega-cities. Sao Paulo. United Nations, 1993.
警告：这些引文格式不一定是100％准确.