Lakhamja, R. ., T. Sonthirak, W. Rawengwan, T. Raksasri, and P. Boonchanda. “Integrating Teaching English Speaking Skills Towards Cooperative Learning for Thai Undergraduate Students”. Humanities and Social Sciences Nakhonsawan Rajabhat University Academic Journal, vol. 8, no. 2, Dec. 2021, pp. 18-28, https://so05.tci-thaijo.org/index.php/hssnsru/article/view/253530.