Khaokham, C. “A COMPARATIVE ANALYSIS OF THE TONES BETWEEN NORTHERN THAI DIALECT TAI YUAN LANGUAGE AND MANDARIN CHINESE”. Chinese Journal of Social Science and Management, vol. 4, no. 2, Dec. 2020, pp. 85-97, https://so01.tci-thaijo.org/index.php/CJSSM/article/view/241783.