Al Tony، F. E. S. (2004). IMPLICATIONS OF THE MARGINAL ECONOMIC BENEFITS AND THE MARGINAL EFFICIENCY OF CAPITAL FOR THE INVESTMENT DECISION IN CAIRO METRO SYSTEM. المجلة العلمية للاقتصاد والتجارة، ع2 ، 83 - 108. مسترجع من http://search.mandumah.com/Record/664420
Al Tony، Fathy El Sayed. "IMPLICATIONS OF THE MARGINAL ECONOMIC BENEFITS AND THE MARGINAL EFFICIENCY OF CAPITAL FOR THE INVESTMENT DECISION IN CAIRO METRO SYSTEM." المجلة العلمية للاقتصاد والتجارة ع2 (2004): 83 - 108. مسترجع من http://search.mandumah.com/Record/664420