ยุทธวงศ์ น. (2020) “THE ETHICAL LEADERSHIP OF SECONDARY SCHOOL PRINCIPALS IN MUANG DISTRICT, TAK PROVINCE”, Pathumthani University Academic Journal, 12(2), pp. 222–233. Available at: https://so05.tci-thaijo.org/index.php/ptujournal/article/view/246281 (Accessed: 29 March 2024).