ภักดีศุภผล ป. . “The Study of Transformational Leadership of School Administrators Under Regional Education Office 18”. Education journal Faculty of Education, Nakhon Sawan Rajabhat University, vol. 3, no. 1, Jan. 2022, pp. 24-37, https://so02.tci-thaijo.org/index.php/edunsrujo/article/view/254286.