Tummawan, C., Navaruttanaporn, S., & Phon-ngam, P. (2023). An Analysis of Ability and Problem Levels in the Use of Classroom English of Non- English Major Teachers in Schools under Loei Primary Educational Service Area Office 2, Loei Province. Journal of Humanities and Social Sciences Loei Rajabhat University, 2(2), 57–70. Retrieved from https://so01.tci-thaijo.org/index.php/husolru/article/view/245738 (Original work published April 30, 2021)