Sontirat, S., Surinya, T. and Jamonman, S. (1988) “The Study for Intelligence Norms of Thai Students”, Kasetsart Journal of Social Sciences, 9(1), pp. 47–67. available at: https://so04.tci-thaijo.org/index.php/kjss/article/view/243854 (accessed: 13 September 2026).