Zein، F. A. M. (2015). The Use of Long Vowels Among Saudi Learners: A Case Study of Students in the Department of English College of Education .Salman bin Abdulaziz University. المجلة العلمية لجامعة الإمام المهدي، ع6 ، 291 - 316. مسترجع من http://search.mandumah.com/Record/753842
Zein، Fatima A. Muhammed. "The Use of Long Vowels Among Saudi Learners: A Case Study of Students in the Department of English College of Education .Salman Bin Abdulaziz University." المجلة العلمية لجامعة الإمام المهدي ع6 (2015): 291 - 316. مسترجع من http://search.mandumah.com/Record/753842