คำยัง ส., นนทภา ด. and นนทภา ด. (2018) “Problem Posing to Enhance Problem Solving Processes for Pythagorean Theorem of Mathayomsuksa 2”, Pathumthani University Academic Journal, 10(1), pp. 192–199. available at: https://so05.tci-thaijo.org/index.php/ptujournal/article/view/181547 (accessed: 10 April 2025).