Demeny, P. G. (1981). The North-South income gap: A demographic perspective. Population Council.
芝加哥风格引文Demeny, Paul George. The North-South Income Gap: A Demographic Perspective. New York: Population Council, 1981.
MLA引文Demeny, Paul George. The North-South Income Gap: A Demographic Perspective. Population Council, 1981.
警告：这些引文格式不一定是100％准确.