Singto, Aphinya. “THE DEVELOPMENT OF STEM EDUCATION LEARNING ACTIVITIES TO ENHANCE PROBLEM SOLVING THINKING ABILITY FOR MATHAYOMSUKSA 1”. Journal of MCU Nakhondhat 7, no. 7 (July 20, 2020): 387–398. Accessed April 26, 2024. https://so03.tci-thaijo.org/index.php/JMND/article/view/245023.