Sawatauea, Phatchari, and Jitraporn Wongkhamjan. “Development Problem-Solving Ability by Using Problem-Based Learning Activities Blended with Mind Mapping Technique for Grade 4 Students”. Journal of Roi Et Rajabhat University 16, no. 3 (December 31, 2022): 109–122. accessed September 12, 2026. https://so03.tci-thaijo.org/index.php/reru/article/view/253581.