Al Mohammad، M. S.، و Hussein، A. A. (2015). Difficulties Faced by Students in Achieving the Required English Standards for the National Assessment in the Independent Preparatory Schools in Qatar (رسالة ماجستير غير منشورة). جامعة أم درمان الاسلامية، ام درمان. مسترجع من http://search.mandumah.com/Record/911605
Al Mohammad، Mohammad Sultan، و Ali Ahmed Hussein. "Difficulties Faced By Students in Achieving the Required English Standards for the National Assessment in the Independent Preparatory Schools in Qatar" رسالة ماجستير. جامعة أم درمان الاسلامية، ام درمان، 2015. مسترجع من http://search.mandumah.com/Record/911605