Sriruang , Sornsawun, and Rittilan Rittilan. 2021. “The Development Guideline Instructional Leadership of School Administrators in Roi- Et Municipality”. Journal of Research and Development Institute Rajabhat Maha Sarakham University 8 (2):469-92. https://so03.tci-thaijo.org/index.php/rdirmu/article/view/251478.