แสนคมคาย ส. (2015). A Comparisons of English Speaking Ability Using Conversation, Self - Confident Entitled “Places” in English of Matthayomsueksa 2 Students Between Situation Simulation and CO - OP CO - OP (Cooperative Learning) Approaches. RMUTI Journal Humanities and Social Sciences, 2(1), 1–10. Retrieved from https://so05.tci-thaijo.org/index.php/RMUTI_SS/article/view/195868