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2. Developmental of mental abilities;Bayley,1970
3. Intelligence at adulthood: A twenty-five year follow-up;Bradway;Journal of Educational Psychology,1962
4. The relative influence of nature and nurture upon mental development: A comparative study of foster parent-foster child resemblance and true parent- true child resemblance;Burks;Twenty-Seventh Yearbook of the National Society for the Study of Education,1928
5. Statistical power analysis for the behavioral sciences;Cohen,1977