1.
Napitupulu MF, Anwar HF, Lubis Y. Error Pronouncing English Vowels. J. Pendidik. Rafflesia [Internet]. 2023 Jun. 30 [cited 2026 Jun. 1];1(2):27-. Available from: https://jurnal.geinrafflesia.com/index.php/JPR/article/view/37