Bunyapapha, Saowakon, and Sunthon Kohtbantau. 2022. “Service Leadership of School Administrators According to the Opinion of Teachers under the Jurisdiction of Chiang Mai Provincial Vocational Education Office”. Journal of Research and Development Institute Rajabhat Maha Sarakham University 9 (3):439-50. https://so03.tci-thaijo.org/index.php/rdirmu/article/view/256144.