Bamroongkit, S., S. Wijakkanalan, and T. Kwangsawad. “Blended English Teaching Model Improving Communicative Skills”. KKU Research Journal (Graduate Studies) Humanities and Social Sciences, Vol. 7, no. 2, July 2019, pp. 59-70, https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/206713.