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Lee, J. et al. (n.d.). Analyses of children's mathematics proficiency from ECLS-K 1998 and 2010 cohorts: Why early mathematics?. Contemporary issues in early childhood. pp. 99-103. [Online].
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Lee, J. et al. (n.d.). Analyses of children's mathematics proficiency from ECLS-K 1998 and 2010 cohorts: Why early mathematics?. Contemporary issues in early childhood. pp. 99-103. [Online].