หวังโสม อ., เลิศอมรพงษ์ ช., & สมใจเพ็ง ต. (2018). EFFECTS OF LEARNING ACTIVITIES ON CONGRUENCE, BASED ON TEACHING PROCEDURE OF VAN HIELE BY USING THE GEOMETER’S SKETCHPAD (GSP). Journal of Humanities and Social Sciences Thonburi University, 12(29), 206–216. Retrieved from https://so03.tci-thaijo.org/index.php/trujournal/article/view/148711