Chumpoojan, Sukrit, and Montri Thongmoon. “The Development of Mathematical Problem-Solving Ability by using Deductive Learning with GeoGebra Program on Preliminary Data Analysis Topic for Matthayomsuksa 6 Students”. Journal of Roi Et Rajabhat University 15, no. 3 (December 22, 2021): 125–133. accessed March 13, 2025. https://so03.tci-thaijo.org/index.php/reru/article/view/242683.