Tanbanjong, Aurapun, and Saroj Pangyoung. “The Construction and Efficiency Evaluation of Competency-based Instructional Modules for Developing the Competencies of the Lower Secondary Mathematics Teachers”. Kasetsart Journal of Social Sciences 9, no. 2 (July 1, 1988): 175–184. accessed September 11, 2026. https://so04.tci-thaijo.org/index.php/kjss/article/view/243871.