Pantusan A, Charuchit P. The Development of School Safety in Educational Opportunity Expansion Schools under the Primary Educational Service Area Offices in Udon Thani Province. JBER [internet]. 2026 Sep. 21 [cited 2026 Sep. 30];12(3):496-511. available from: https://so06.tci-thaijo.org/index.php/jber/article/view/292042