Gacharoen, Natthiya, and Laddawan Petchroj. “Leadership in the 21st Century for School Administrators Under the Secondary Educational Service Area Office Nonthaburi”. Journal of Humanities and Social Sciences, Rajapruk University 9, no. 3 (December 31, 2023): 52–69. accessed September 23, 2026. https://so03.tci-thaijo.org/index.php/rpu/article/view/274233.