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دليل المستخدم
Al Braik، M. S.، و Edward، R. F. (1986). Investigation of the Successful Attributes of English as a Second Language of Saudi Arabian Students Studying in the United States of America (رسالة دكتوراه غير منشورة). Pennsylvania State University، بنسلفانيا. مسترجع من http://search.mandumah.com/Record/612078
Al Braik، Mubarak Salem، و R. Fagan Edward. "Investigation of the Successful Attributes of English As a Second Language of Saudi Arabian Students Studying in the United States of America" رسالة دكتوراه. Pennsylvania State University، بنسلفانيا، 1986. مسترجع من http://search.mandumah.com/Record/612078