Ubonnoi, Pakkaphorn, and Peerapat Yangklang. 2021. “The Development of English Speaking Skills Using a Task-Based Learning Approach Focused on Selling Local Products for the Ninth Grade Students”. Journal of Education Studies 49 (4). Bangkok, Thailand:EDUCU4904013(13 pages) doi: 10.14456/educu.2021.72. https://so02.tci-thaijo.org/index.php/EDUCU/article/view/253621.