ช่วยรักษา ด. Internal Quality Assurance System of Opportunity Expansion Schools under SakonNakhon Primary Educational Service Area Office. ptujournal [internet]. 2019 Jun. 14 [cited 2026 Sep. 24];11(1):197-208. available from: https://so05.tci-thaijo.org/index.php/ptujournal/article/view/187067