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Zahn-Waxler, C. & R. - Y., M. (1982). The development of altruism: Alternative research strategies. In N. Eisenberg (Ed.), The development of prosocial behavior (pp. 109–138). New York: Academic Press.
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Zahn-Waxler, C., & Radke-Yarrow, M. (1982). The Development of Altruism: Alternative Research Strategies. The Development of Prosocial Behavior, .
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