Judy A. Ungerer, Philip R. Zelazo, Richard B. Kearsley, Kathleen O'Leary, Developmental Changes in the Representation of Objects in Symbolic Play from 18 to 34 Months of Age, Child Development, Vol. 52, No. 1 (Mar., 1981), pp. 186-195
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Ungerer et al. (1981) studied this question.
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