Khamtorn, P., & Kornpuang, A. (2023). The Relationship Between Transformational Leadership and 21st Century Skills of Schooladministrators Under Phitsanulok Primary Educational Service Area Office 3. Journal of Modern Learning Development, 8(6), 59–69. retrieved from https://so06.tci-thaijo.org/index.php/jomld/article/view/260483