Khum-un S, Ruaengsri S. The Development of Mathematics Learning Activities Using a Constructivist Approach for Undergraduate Students in a Mathematics Education Program. JSSRA [internet]. 2024 May 30 [cited 2025 Dec. 6];19(2):173-86. available from: https://so05.tci-thaijo.org/index.php/JSSRA/article/view/270464