Sukseethong S, Muangman P, Srimakutphun N. Developing of Internal Quality Assurance System Model in Private School Under Nonthaburi Primary Education Service Area Office 1. Ph.D. in Soc. Sci. J. [internet]. 2019 Dec. 30 [cited 2026 Aug. 30];9(3):775-88. available from: https://so05.tci-thaijo.org/index.php/phdssj/article/view/125147