Phola, Sombut, Saowalak Kosonkittiumporn, and Sanya Kaenapoom. 2019. “Achievement Management Model of Secondary Schools in the Northeastern Region”. Journal of Graduate MCU KhonKaen Campus 6 (2):360-73. https://so02.tci-thaijo.org/index.php/jg-mcukk/article/view/243595.