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Paul L. Harris, Robert D. Kavanaugh, Henry M. Wellman, Anne K. Hickling, Young Children's Understanding of Pretense, Monographs of the Society for Research in Child Development, Vol. 58, No. 1, Young Children's Understanding of Pretense (1993), pp. i+iii+v+1-107
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Harris et al. (1993) studied this question.
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