سلام، وليد يحيى. (2011). Economic Analysis of the Current Situation for Production, Export and the Competitiveness of Egyptian Green Peas in international Markets. المجلة المصرية للإقتصاد الزراعي، مج21, ع3 ، 940 - 955. مسترجع من http://search.mandumah.com/Record/1481259
سلام، وليد يحيى. "Economic Analysis of the Current Situation for Production, Export and the Competitiveness of Egyptian Green Peas in International Markets." المجلة المصرية للإقتصاد الزراعي مج21, ع3 (2011): 940 - 955. مسترجع من http://search.mandumah.com/Record/1481259