Louise B. Miller, Jean L. Dyer, Harold Stevenson, Sheldon H. White, Four Preschool Programs: Their Dimensions and Effects, Monographs of the Society for Research in Child Development, Vol. 40, No. 5/6, Four Preschool Programs: Their Dimensions and Effects (Oct., 1975), pp. 1-170
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Miller et al. (1975) studied this question.
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