surinya, Tippavan. 1985. “The study on the Relationship Between Intelligence Quotient Obtained from the Coloured Progressive Matrices and Piaget’s Theory on the stages of Cognitive Development of Thai Children, Age 5-11 Years”. Kasetsart Journal of Social Sciences 6 (2):135-39. https://so04.tci-thaijo.org/index.php/kjss/article/view/243558.