Phong-a-ran, N. ., Supaweena Luksup , S. L. . and Chaisoda, P. . (2019) “ENGLISH PROFICIENCY OF THAI UNDERGRADUATE STUDENTS USING CEFR IN KHONKAEN ”, Journal of Buddhist Education and Research (JBER), 5(2), pp. 160–172. available at: https://so06.tci-thaijo.org/index.php/jber/article/view/242222 (accessed: 11 December 2025).