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Marian Radke Yarrow, Carolyn Zahn Waxler, David Barrett, Jean Darby, Robert King, Marilyn Pickett, Judith Smith, Dimensions and Correlates of Prosocial Behavior in Young Children, Child Development, Vol. 47, No. 1 (Mar., 1976), pp. 118-125
Yarrow et al. (Mon,) studied this question.
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