Bushnak، A. A.، و Clevelو، D. E. (1977). PLANNING AND EVALUATION OF SPECIAL EVENT TRANSPORTATION SYSTEMS WITH APPLICATION TO THE HAJJ (رسالة دكتوراه غير منشورة). University of Michigan، آنآربر. مسترجع من http://search.mandumah.com/Record/615063
Bushnak، Adil Ahmad، و Donald E. Clevelو. "PLANNING AND EVALUATION OF SPECIAL EVENT TRANSPORTATION SYSTEMS WITH APPLICATION TO THE HAJJ" رسالة دكتوراه. University of Michigan، آنآربر، 1977. مسترجع من http://search.mandumah.com/Record/615063