Keith, T. Z., Harrison, P. C., & Ehly, S. (1987). Effects of adaptive behavior or achievement: Path analysis of a national sample. Professional School Psychology, 2, 205-215.
2.
Roberts, J. (1971). Intellectual development of children by demographic and socioeconomic factors. Washington: DHEW No. (HSM) 72-1012.
3.
Schlesinger, J. M., & Guttman, I. (1969). Smallest space analysis of intelligence and achievement tests. Psychological Bulletin, 71, 95-100.
4.
Somwaru, J. P. (1979a). Survey of Basic Competencies. Bensenville, IL: Scholastic Testing Service.
5.
Somwaru, J. P. (1979b). Test of Early Learning Skills. Bensenville, IL: Scholastic Testing Service.
6.
Somwaru, J. P. (1983). Assessment of Basic Competencies: An alternative to intelligence tests. Diagnostique, 8, 221-240.