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Sausan Sabila, Afrahul Fadhillah Parinduri, Dedy Suhery, Rahmadsyah Rangkuti. Contrastive Analysis English Vowel Produced By Mandailing Speakers. atmosfer [Internet]. 2026 Jul. 3 [cited 2026 Aug. 2];4(3):54-67. Available from: https://pbsi-upr.id/index.php/atmosfer/article/view/1841