Poonchu, Pongsa, and Sajeewan Darbavasu. “haracteristics of rofessional dministrators ffecting the fficiency of rivate chool anagement under the amut rakan rovincial ducation ffice”. Journal of Humanities and Social Sciences, Rajapruk University 7, no. 2 (August 25, 2021): 156-169. ccessed December 8, 2021. https://so03.tci-thaijo.org/index.php/rpu/article/view/254783.