Thipkong, Siriporn. “The Study of Matayomsuksa Two Students’ Ability in Solving Linear Equation with One Variable in the Different Models”. Kasetsart Journal of Social Sciences 14, no. 1 (January 1, 1993): 46–50. accessed September 11, 2026. https://so04.tci-thaijo.org/index.php/kjss/article/view/244083.