1. Cantor, R. M. (1983). A multivariate genetic analysis of ridge count data from the offspring of monozygotic twins.Acta Genet. Med. Gemmellol. 32:161?270.
2. Fulker, D. W., Baker, L. A., and Bock, R. D. (1983). Estimating components of covariance using LISREL.Data Anal. Comm. Comp. Data Anal. 1:5?8.
3. Jöreskog, K. G. (1973). Analysis of covariance structures. In Krishnaiah, P. R. (ed.),Multivariate Analysis III, Academic Press, New York.
4. Jöreskog, K. G., and Sörbom, D. (1981).LISREL: Analysis of Linear Structural Relationships by Maximum Likelihood and Least Squares Methods, National Educational Resources, Chicago.
5. Loehlin, J. C., and Vandenberg, S. G. (1968). Genetic and environmental components in the covariation of cognitive abilities: An additive model. In Vandenberg, S. G. (ed.),Progress in Human Behaviour Genetics, Johns Hopkins, Baltimore, pp. 261?278.