Dongja-Roen P. Guidelines for Teacher Development to Enhance Self-Discipline of High School Students School Expands Educational Opportunities in Lam Sonthi District Under Lopburi Primary Educational Service Area 2. jg-mcukk [internet]. 2022 Sep. 30 [cited 2026 Sep. 2];9(3):196-20. available from: https://so02.tci-thaijo.org/index.php/jg-mcukk/article/view/254972