S. Chiawdee, M. Phattarachaleekul, and N. Chutiman, “Development of Mathematics Learning Activities Based on Constructivist Theory Cooperated with Electronic Media to Promote Problem Solving Abilities on Triangle for Grade 6 Students”, J. Sci. & Sci. Educ., vol. 7, no. 2, pp. 446–455, Oct. 2024.