1. Baker, L. A., DeFries, J. C., and Fulker, D. W. (1983). Longitudinal stability of cognitive ability in the Colorado Adoption Project.Child Dev. 54:290?297.
2. Bock, R. D., Wainer, H., Petersen, A. C., Thissen, D., Murray, J., and Roche, A. (1973). A parameterization for individual growth curves.Hum. Biol. 45:63?68.
3. Cantor, R. M., Nance, W. E., Eaves, L. J., Winter, P. M., and Blanchard, M. M. (1983). Analysis of the covariance structure of digital ridge counts in the offspring of monozygotic twins.Genetics 103:495?512.
4. Cattell, R. B. (1966).Handbook of Multivariate Experimental Psychology, Rand McNally, New York.
5. Cattell, R. B. (1982).The Inheritance of Personality and Ability: Research Methods and Findings, Academic Press, New York.