ธีรานนท์ ผณินทรา. “Thai Tones in the Reigns of King Rama VI and King Rama IX”. Language and Linguistics 21, no. 1 (March 28, 2019): 32–46. Accessed May 19, 2024. https://so04.tci-thaijo.org/index.php/joling/article/view/180619.