References
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- Kendler , T. S. , Kendler , H. H. and Wells , D. 1960 . “Reversal and Non‐reversal Shifts in Nursery School Children,” . J. Comp. Physiol. Psych , 52 : 387 – 89 .
- Luria , A. R. 1961 . The Role of Speech in the Regulation of Normal and Abnormal Behaviour , New York : Pergamen Press .