National Research Council (U.S.). Committee on the General Aptitude Test Battery, Hartigan, J. A., & Wigdor, A. K. (1989). Fairness in employment testing: Validity generalization, minority issues, and the General Aptitude Test Battery. National Academy Press.

National Research Council (U.S.). Committee on the General Aptitude Test Battery, John A. Hartigan, and Alexandra K. Wigdor. Fairness in Employment Testing: Validity Generalization, Minority Issues, and the General Aptitude Test Battery. Washington, D.C.: National Academy Press, 1989.

National Research Council (U.S.). Committee on the General Aptitude Test Battery, et al. Fairness in Employment Testing: Validity Generalization, Minority Issues, and the General Aptitude Test Battery. National Academy Press, 1989.