Boonphadung, Suttipong. 2017. “The Development of Learning Model for Enhancing Critical Thinking Ability in Mathematics of Junior High School Students”. Humanities and Social Sciences Journal of Pibulsongkram Rajabhat University 12 (1):218-36. https://so01.tci-thaijo.org/index.php/GraduatePSRU/article/view/87670.