Sangsuk, Pattarajittra, Ornuma Charoensuk, and Chaiyut Kleebbua. “A causal model of learning achievement of upper primary students with learning engagement as a mediator variable”. Kasetsart Journal of Social Sciences 43, no. 2 (April 30, 2022): 337‒344. accessed October 11, 2026. https://so04.tci-thaijo.org/index.php/kjss/article/view/258546.