PRONUNCIATION PROBLEMS IN THAI TONES OF CENTRAL VIETNAMESE LEARNERS. Journal of Foreign Language Studies, [S. l.], n. 76, p. 3–16, 2024. DOI: 10.56844/tckhnn.76.728. Disponível em: http://journals.hanu.edu.vn/index.php/tckhnn/article/view/728. Acesso em: 16 jan. 2026.