Elshafei, A. (1969). Analysis of A Two-Channel Queuing Model: ( A Simulation Approach ). The Institute of National Planning.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Elshafei, Alwalid. Analysis of A Two-Channel Queuing Model: ( A Simulation Approach ). Cairo: The Institute of National Planning, 1969.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Elshafei, Alwalid. Analysis of A Two-Channel Queuing Model: ( A Simulation Approach ). The Institute of National Planning, 1969.