Pongpiyanurat, Nuttapon, Ittiwat Srisombat, and Phatra Intrakamhaeng. “Guidelines for Developing Educational Institutions into Happy Organizations: Case study Ngaengkwang School, Sikhio District, Surin Province”. Journal of Srisuvarnabhumi Review 4, no. 3 (September 16, 2026): 331–345. accessed September 21, 2026. https://so14.tci-thaijo.org/index.php/JSBR/article/view/3465.