Sanpha-asa, N., Sroinam, S. and Homsin, N. (2019) “The Causal Relationship Model of Factors Affecting OperationalEffectiveness of Internal Quality Assurance in Private Schools in the Northeastof Thailand”, Journal of Graduate MCU KhonKaen Campus, 6(1), pp. 314–328. available at: https://so02.tci-thaijo.org/index.php/jg-mcukk/article/view/243674 (accessed: 15 September 2026).