Putthima, Pornpen, Ampapan Tuntinakhongul, and Pariyaporn Tungkunanan. 2021. “Factors Analysis of Leadership in the 21st Century of Department Heads Under the Vocationnal Education in Central Region of Thailand”. RMUTI Journal Humanities and Social Sciences 8 (1):51-67. https://so05.tci-thaijo.org/index.php/RMUTI_SS/article/view/250024.