Al Shahrany، M. S.، و Howe، R. W. (1995). THE RELATIONSHIP OF SELECTED STUDENT, TEACHER, AND SCHOOL VARIABLES TO BIOLOGY ACHIEVEMENT OF SENIORS IN SECONDARY SCHOOLS IN SAUDI ARABIA (رسالة دكتوراه غير منشورة). Ohio State University، كولومبوس. مسترجع من http://search.mandumah.com/Record/613608
Al Shahrany، Mohammed S.، و Robert W. Howe. "THE RELATIONSHIP OF SELECTED STUDENT, TEACHER, AND SCHOOL VARIABLES TO BIOLOGY ACHIEVEMENT OF SENIORS IN SECONDARY SCHOOLS IN SAUDI ARABIA" رسالة دكتوراه. Ohio State University، كولومبوس، 1995. مسترجع من http://search.mandumah.com/Record/613608