1.
Setyaningsih KP, Wijayanto A, Suparno S. English Vowels and Diphthongs Problems of Sundanese Learners. ELS-JISH [Internet]. 2019Dec.17 [cited 2024Nov.22];2(4):571-8. Available from: https://journal-old.unhas.ac.id/index.php/jish/article/view/8413