BayleyN.Comparisons of mental and motor test scores for ages 1–15 months by sex, birth order, race, geographical location and education of parents. Child Development, 1965; 36, 379–411.
2.
BurtC.The inheritance of mental ability. American Psychologist, 1958; 13, 1–15.
3.
CattellR. B.Theory of fluid and crystalized intelligence: A critical experiment. Journal of Educational Psychology, 1963; 54, 1–2.
4.
CooperG. D.YorkM. W.DastonP. G., & AdamsH. B.The Porteus Test and various measures of intelligence with southern Negro adolescents. American Journal of Mental Deficiency, 1967; 71, 787–792.
5.
JensenA. R.A theory of primary and secondary familiar mental retardation. In EllisN. R. (Ed.), International review of research in mental retardation. Vol. 4. New York: Academic Press, 1970.
6.
MuellerM. W., & WeaverS. J.Psycholinguistic abilities of institutionalized and noninstitutionalized trainable mentally retarded. American Journal ot Mental Deficiency, 1964; 68, 775–783.
7.
RohwerW. D.Learning race and school success. Review of Educational Research, 1971; 41, 191–209.
8.
SchwarzR. H., & ShoresR. E.The academic achievement of educable mentally retarded students and social class. American Journal of Mental Deficiency, 1969; 74, 338–340.
9.
SmithJ. O.Group language development for educable mentally retarded. Exceptional Children, 1962; 29, 95–101.
10.
WeaverJ. S., & WeaverA.Psycholinguistic abilities of culturally deprived Negro children. American Journal of Mental Deficiency, 1967; 72, 190–197.
11.
WechslerD.The measurement and appraisal of adult intelligence. (4th ed.) Baltimore: Williams & Williams, 1958.