ใจกันทา ณ. (2018). The Administration Strategies for Educational Supervision in the 21st Century Education of Chiang Rai Primary Educational Service Area Office 3. Journal of Research and Development Buriram Rajabhat University, 13(2), 47–59. retrieved from https://so03.tci-thaijo.org/index.php/RDIBRU/article/view/164079