Rizk، F. H. (2000). Policies of Production, Marketing and Pricing of Cottonseed and Important Oil Seeds. مجلة مصر المعاصرة، مج91, ع459,460 ، 89 - 105. مسترجع من http://search.mandumah.com/Record/663811
Rizk، Fawzy H. "Policies of Production, Marketing and Pricing of Cottonseed and Important Oil Seeds." مجلة مصر المعاصرة مج91, ع459,460 (2000): 89 - 105. مسترجع من http://search.mandumah.com/Record/663811