Sudhinont, Jomkwan. “Teaching Tones to Foreigners Learning the Thai Language”. Journal of Human and Society, Sisaket Rajabhat University 8, no. 2 (December 30, 2024): 21–45. accessed May 10, 2025. https://so08.tci-thaijo.org/index.php/jhuso/article/view/3291.