เนื่องภักดี ร. The Development of Mathematics Learning Activities Based on The Constructivist Theory Emphasizing Polya’s Problem Solving Processes on Quadrilaterals for Prathomsuksa 6. EDGKKUJ [Internet]. 2018 May 24 [cited 2024 May 6];11(4):108-1. Available from: https://so02.tci-thaijo.org/index.php/EDGKKUJ/article/view/125410