Thamsuan, Jongkol, and Sansanee Nenthien. “Guidelines for Designing Mathematical Problems and Real-life Problems with the Development of Critical Thinking”. Journal of Education Studies, Chulalongkorn University 49, no. 4 (December 23, 2021): EDUCU4904014. accessed September 11, 2026. https://so02.tci-thaijo.org/index.php/EDUCU/article/view/253746.