Naji, M. H. S., & Al-Hazemi, H. A. (2021). Examining British English Vowels Pronunciation by Yemeni and Saudi EFL Learners: A Study of Vowel Perception and Production. Imam Mohammad ibn Saud Islamic University, College of Languages and Translation, Department of English Language and Literature.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Naji, Mohammed Hezam S., و Hassan Ali Al-Hazemi. Examining British English Vowels Pronunciation by Yemeni and Saudi EFL Learners: A Study of Vowel Perception and Production. Riyadh: Imam Mohammad ibn Saud Islamic University, College of Languages and Translation, Department of English Language and Literature, 2021.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Naji, Mohammed Hezam S., و Hassan Ali Al-Hazemi. Examining British English Vowels Pronunciation by Yemeni and Saudi EFL Learners: A Study of Vowel Perception and Production. Imam Mohammad ibn Saud Islamic University, College of Languages and Translation, Department of English Language and Literature, 2021.