Elshafei, A. (1969). On The Machine Interference Problem. The Institute of National Planning.
Čikaški stil citiranja (17. izdanje)Elshafei, Alwalid. On The Machine Interference Problem. Cairo: The Institute of National Planning, 1969.
MLA način citiranja (9. izdanje)Elshafei, Alwalid. On The Machine Interference Problem. The Institute of National Planning, 1969.
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