ชื่นสุวิมล บ., and สัณห์สุรัติกุล อ. “How Is (r) in French Pronounced by Thai Students?”. Language and Linguistics, vol. 22, no. 1, Mar. 2019, pp. 1-13, https://so04.tci-thaijo.org/index.php/joling/article/view/180559.