标题1：Altruism, Egoism, and Genetic Fitness: Economics and Sociobiology

作者：Gary S. Becker

期刊：Journal of Economic Literature, Vol. 14, No. 3 (Sep., 1976), pp. 817-826   (article consists of 10 pages)

链接：http://www.jstor.org/pss/2722629

标题2：A Theory of Social Interactions

作者：Gary S. Becker

期刊：The Journal of Political Economy, Vol. 82, No. 6 (Nov. - Dec., 1974), pp. 1063-1093   (article consists of 31 pages)

链接：http://www.jstor.org/pss/1830662

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