Sangthongchai, Pimtucksa-on, and Subin Yurarach. 2026. “Management Approaches to Enhance Students’ Happiness in Schools under the Samut Prakan Secondary Educational Service Area Office”. Journal of Education Yala Rajabhat University 5 (1). Yala, Thailand:76-88. https://so08.tci-thaijo.org/index.php/jeduyru/article/view/5958.