T. Khoirunnisa.YL, Winda Khofifah, and Yani Lubis. “Teori Phonology English Vowels”. CENDEKIA: Jurnal Ilmu Sosial, Bahasa dan Pendidikan 3, no. 3 (June 19, 2023): 15–24. Accessed March 20, 2026. https://prin.or.id/index.php/cendikia/article/view/1374.