Purinthrapibal, S. (2018) “Problems in French Nasal Vowel Pronunciation of Secondary Schools Learners in Fourteen Southern Provinces of Thailand”, Journal of International Studies, Prince of Songkla University, 8(2), pp. 172–194. available at: https://so03.tci-thaijo.org/index.php/jis/article/view/146864 (accessed: 12 September 2026).