ULLAH, I.; SAEED, M. S. An Analysis of Problematic Vowel Sounds for College Level Students in District Buner. JELLL, [S. l.], v. 2, n. 1, p. 37–48, 2024. Disponível em: https://ojs.aiou.edu.pk/index.php/jelll/article/view/1931. Acesso em: 3 jul. 2024.