Kruelamai, P., & Keeratichamroen, W. (2024). A Comparison of Learning Achievement on Enjoyable Thinking with Pyramid Cone and Sphere and Problem Solving Ability of Grade 9 Students between Using MEAs and SSCS Model. Ratchaphruek Journal, 22(3), 116–130. https://doi.org/10.14456/rpjnrru.2024.38