Sitha, Siriwan, and Urit Charoen-In. “DEVELOPING COLLABORATIVE PROBLEM SOLVING IN PHYSICS OF MATHAYOMSUKSA 5 STUDENTS BY USING PROBLEM – BASED LEARNING”. Journal of MCU Nakhondhat 7, no. 5 (May 20, 2020): 279–292. accessed December 5, 2025. https://so03.tci-thaijo.org/index.php/JMND/article/view/243404.