Al Ghamdi، A. A. S. B.، و Bjork، R. M. (1982). SELECTED FACTORS ASSOCIATED WITH INTERMEDIATE AND HIGH SCHOOL DROPOUTS IN RURAL SOUTHWESTERN SAUDI ARABIA (رسالة دكتوراه غير منشورة). Vanderbilt University، ناشفيل. مسترجع من http://search.mandumah.com/Record/620554
Al Ghamdi، Ali Ahmad S. Bosaili، و Robert M. Bjork. "SELECTED FACTORS ASSOCIATED WITH INTERMEDIATE AND HIGH SCHOOL DROPOUTS IN RURAL SOUTHWESTERN SAUDI ARABIA" رسالة دكتوراه. Vanderbilt University، ناشفيل، 1982. مسترجع من http://search.mandumah.com/Record/620554