1. Gender differences in means and variance on the Standard Progressive Matrices in Pakistan;Ahmad;Mankind Quarterly,2008
2. Genetics of educational attainment in Australian twins: Sex differences and secular changes;Baker;Behavior Genetics,1996
3. The application of molecular genetic approaches to the study of human evolution;Cavalli-Sforza;Nature Genetics Supplement,2003
4. Are mathematics and science test scores good indicators of labor-force quality?;Chen;Social Indicators Research,2010
5. Eff, E. A. (2004). Spatial and cultural autocorrelation in international datasets. Department of Economics and Finance Working Paper Series, February 2004. Retrieved 21 February 2006 from .