Saif، J. A.، و Mann، W. A. (1973). AN EXAMINATION OF THE KNOWLEDGE OF TRAFFIC REGULATIONS AND DEFENSIVE DRIVING AMONG A SELECTED SAMPLE OF SAUDI ARABIAN PRIVATE CAR OWNERS (رسالة دكتوراه غير منشورة). Michigan State University، إيست لانسنيغ. مسترجع من http://search.mandumah.com/Record/615524
Saif، Jallei A.، و William A. Mann. "AN EXAMINATION OF THE KNOWLEDGE OF TRAFFIC REGULATIONS AND DEFENSIVE DRIVING AMONG A SELECTED SAMPLE OF SAUDI ARABIAN PRIVATE CAR OWNERS" رسالة دكتوراه. Michigan State University، إيست لانسنيغ، 1973. مسترجع من http://search.mandumah.com/Record/615524