Rullu, ST Marhana, Desriani Nggolaon, and Nurviana Budahu. “Error Analysis of English Vowels Pronunciation Made by The Students of English Education Study Program”. Qalam : Jurnal Ilmu Kependidikan 12, no. 1 (July 3, 2023): 81–93. Accessed July 3, 2024. https://ejournal.um-sorong.ac.id/index.php/jq/article/view/2542.