bamrunguea, supa, Piyatida Panya, and Paisarn Worakham. “Research and Development Programs to Enhance Problem-Solving Ability for 5-Years-Old Children”. Ratchaphruek Journal 22, no. 1 (April 4, 2024): 203–218. accessed September 18, 2026. https://so05.tci-thaijo.org/index.php/Ratchaphruekjournal/article/view/267239.