Nget, S. ., O. Pansri, and C. Poohongthong. “The Effect of Task-Based Instruction in Improving the English Speaking Skills of Ninth-Graders”. LEARN Journal: Language Education and Acquisition Research Network, vol. 13, no. 2, July 2020, pp. 208-24, https://so04.tci-thaijo.org/index.php/LEARN/article/view/243708.