Viwattananon, Suwat, and Punya Sirichot. “The Development of Training Program for Improving Efficiency of Quality Management System Utilized by Head of Academic Department in Secondary School”. Ph.D. in Social Sciences Journal 10, no. 1 (April 27, 2020): 179–196. Accessed February 4, 2023. https://so05.tci-thaijo.org/index.php/phdssj/article/view/230001.