Pisapak J, Thipkong S. The Development of Mathematics Ability in Solving Problems for Prathomsuksa 2 Students at Kasetsart University Laboratory School by Using Polya’s Problem Solving Process. kasetsart J. Soc. Sci. [internet]. 2009 Apr. 30 [cited 2026 Sep. 11];30(1):1-9. available from: https://so04.tci-thaijo.org/index.php/kjss/article/view/246479