Rindermann, H (2007). "The g-factor of international cognitive ability comparisons: The homogeneity of results in PISA, TIMSS, PIRLS and IQ-tests across nations". European Journal of Personality. 21 (5): 667–706. doi:10.1002/per.634. S2CID8662680.
Hunt, E (2010). "The rights and responsibilities implied by academic freedom". Personality and Individual Differences. 49 (4): 264–271. doi:10.1016/j.paid.2010.01.011.
Rindermann, H (2007). "The g-factor of international cognitive ability comparisons: The homogeneity of results in PISA, TIMSS, PIRLS and IQ-tests across nations". European Journal of Personality. 21 (5): 667–706. doi:10.1002/per.634. S2CID8662680.