Tanbanjong, A. and Pangyoung, S. (1988) “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(2), pp. 175–184. available at: https://so04.tci-thaijo.org/index.php/kjss/article/view/243871 (accessed: 11 September 2026).