| Heckman, James J; Karapakula, Ganesh 2019 | Ypsilanti, MI: High Scope Educational Research Foundation |
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| Dougherty and Haith of the , "Infant Expectations and Reaction Time as Predictors of Childhood Speed of Processing and IQ", published in volume 33 1997 of the journal Developmental Psychology | "Moving towards inclusive education policies and practices? "Jean Piaget: Champion of children's ideas" |
| Sally Neaum 17 May 2013 | State of New Jersey Department of Education |
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| US Department of Health, Education, and Welfare, Office of Education | Readings on the Development of Children: 7—20 |