Atthaprajong, Supranee, and Suracha Amornpan. “The Strengthen Teacher Competency Program in Classroom Management for School under Secondary Education Service Area Office 20”. Journal of Education Rajabhat Maha Sarakham University 17, no. 1 (March 4, 2020): 519–527. Accessed May 13, 2024. https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/252234.