Marc H. Bornstein, O. Maurice Haynes, Anne Watson O'Reilly, Kathleen M. Painter, Solitary and Collaborative Pretense Play in Early Childhood: Sources of Individual Variation in the Development of Representational Competence, Child Development, Vol. 67, No. 6 (Dec., 1996), pp. 2910-2929
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Bornstein et al. (1996) studied this question.
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