Boonmee, W. ., and P. Thammasit. “ADMINISTRATIVE SKILLS IN THE 21ST CENTURY OF SCHOOL ADMINISTRATORS IN UTTARADIT SECONDARY SCHOOLS”. Journal of MCU Nakhondhat, vol. 7, no. 5, May 2020, pp. 172-8, https://so03.tci-thaijo.org/index.php/JMND/article/view/243395.