Balleras, J. M., Yippikun, C. ., Castro, R. B. and Prasertsak, A. . (2025) “Developing a standardized English proficiency test based on the CEFR and language test development manual”, Journal of English Language and Linguistics . Buriram, Thailand, 6(2), pp. 169–189. doi: 10.62819/jel.2025.1007.