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Linda Moxley-Haegert, Lisa A. Serbin, Developmental Education for Parents of Delayed Infants: Effects on Parental Motivation and Children's Development, Child Development, Vol. 54, No. 5, Infants at Risk (Oct., 1983), pp. 1324-1331
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Moxley‐Haegert et al. (1983) studied this question.
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