Khedr، H. A. (1982). TECHNICAL EFFICIENCY IN THE PRODUCTION OF EGYPTIAN CORN: SOME ECONOMETRIC COMPARISONS. مجلة مصر المعاصرة، مج73, ع387,388 ، 17 - 24. مسترجع من http://search.mandumah.com/Record/663750
Khedr، Hassan Aly. "TECHNICAL EFFICIENCY IN THE PRODUCTION OF EGYPTIAN CORN: SOME ECONOMETRIC COMPARISONS." مجلة مصر المعاصرة مج73, ع387,388 (1982): 17 - 24. مسترجع من http://search.mandumah.com/Record/663750