Pangpis, S., C. Phrompui, and S. . Romsri. “The Self-Discipline Development Activities Management of Schools under the Surin Secondary Education Service Area Office”. Journal of Research and Development Institute Rajabhat Maha Sarakham University, vol. 9, no. 1, Apr. 2022, pp. 503-12, https://so03.tci-thaijo.org/index.php/rdirmu/article/view/254172.