Jomtraikhup , R., S. . Peantanyakorn, and S. . Phothiwat. “A Casual Relationship Model of Selected Factors Affecting Effectiveness of Secondary Schools in the Northeastern Part of Thailand”. Journal of Roi Et Rajabhat University, vol. 15, no. 1, Dec. 2020, pp. 16-27, https://so03.tci-thaijo.org/index.php/reru/article/view/238505.