1. A twin study of mathematics disability;Alarcón;Journal of Learning Disabilities,1997
2. Statistical estimates and transformed beta variables;Blom,1958
3. Structural equations with latent variables;Bollen,1989
4. Concurrent validity of the WRAT;Covin;Perceptual and Motor Skills,1976
5. DeFries, J. C., Filipek, P. A., Fulker, D. W., Olson, R. K., Pennington, B. F., Smith, S. D., & Wise, B. W. (1997). Colorado Learning Disabilities Research Center. Learning Disabilities: A Multidisciplinary Perspective, 8, 7–19.