1.
Suranna M, Khansila P, Nongharnpituk P. The development of problem-solving ability on addition and subtraction of 4th grade students using Polya’s method with Bar model. J. Sci. & Sci. Educ. [internet]. 2023 May 24 [cited 2025 Apr. 6];6(2):269-7. available from: https://so04.tci-thaijo.org/index.php/JSSE/article/view/263978