เทพตั้ง ป, นนทภา ด, นนทภา ด. Study Problem Solving Mathematical Skill According Concept Mayer of Matayomsuksa 3 Students. ptujournal [Internet]. 2018 May 31 [cited 2024 Apr. 29];10(1):258-65. Available from: https://so05.tci-thaijo.org/index.php/ptujournal/article/view/181659