National Shipyards and Steel Corporation & National Shipyards and Steel Corporation. [Report. [s.n.].
Cita Chicago (17th ed.)National Shipyards and Steel Corporation i National Shipyards and Steel Corporation. [Report. Manila: [s.n.].
Cita MLA (9th ed.)National Shipyards and Steel Corporation i National Shipyards and Steel Corporation. [Report. [s.n.].
Atenció: Aquestes cites poden no estar 100% correctes.