Sukchuen, Nattakarn. “An Evaluation of English Proficiency of First-Year Students at Kasetsart University Using Communicative and Grammar-Based Instruction”. Kasetsart Journal of Social Sciences 22, no. 1 (January 1, 2001): 73–78. accessed September 12, 2026. https://so04.tci-thaijo.org/index.php/kjss/article/view/243514.