Sitthi, Rapeeporn, and Kalaya Tingsabadh. “Lexical and tonal variation in Khorat Thai by age group and ease of communication”. Language and Linguistics 26, no. 2 (February 26, 2019): 76–92. accessed September 10, 2026. https://so04.tci-thaijo.org/index.php/joling/article/view/174573.