Yomyao, A., and M. Khammun. “Study of English Language Teaching in Higher Vocational Schools in Thailand: A Case Study of English Language Teaching in Higher Vocational Schools in Chiang Rai Province”. Journal of Advanced Development in Engineering and Science, vol. 2, no. 4, Aug. 2023, pp. 44-48, https://ph03.tci-thaijo.org/index.php/pitjournal/article/view/782.