Pirat, Phra Noppon. “Speaking Skill Development Through Conversation Exercises for Mattayom Suksa 3 Students of Buddha Kosai Wittaya School Phrae”. Journal of Lanna Societies 1, no. 1 (August 30, 2023): 21–30. accessed October 3, 2026. https://so13.tci-thaijo.org/index.php/jls/article/view/223.