Boonchom, Wanchana, and Jutamanee Tipparach. “A Study of Effectiveness on the 6 Principles for Exemplary Teaching of English Learners”. Journal of Graduate School, Pitchayatat, Ubon Ratchathani Rajabhat University 16, no. 2 (August 20, 2021): 241–253. Accessed May 3, 2024. https://so02.tci-thaijo.org/index.php/Pitchayatat/article/view/249668.