Petrill, S.A., Kovas, Y., Hart, S.A., Thompson, L.A., & Plomin, R (2009). The Genetic and Environmental Etiology of High Math Performance in
10-Year-Old Twins. Behavioral Genetics. Available online.
Petrill, S.A., & Thompson, L.A. (1993). The phenotypic and genetic
relationships among measures of cognitive ability, temperament and
scholastic achievement. Behavior Genetics, 23, 511-518.