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”. Journal of Graduate MCU KhonKaen Campus, vol. 9, no. 3, Sept. 2022, pp. 196-0, https://so02.tci-thaijo.org/index.php/jg-mcukk/article/view/254972.