Wongsuwan K, Pienthunyakorn S, Phothivat S. THE CAUSAL RELATIONSHIP MODEL OF INTERNAL QUALITY ASSURANCE OPERATIONAL EFFECTIVENESS OF THE SMALL SIZED PRIMARY SCHOOLS IN THE NORTHEAST. JSC [internet]. 2023 Feb. 28 [cited 2026 Sep. 10];7(2):187-204. available from: https://so06.tci-thaijo.org/index.php/JSC/article/view/261835