Perez, D. (1999). Steel firm was bound to fail. Manila Bulletin.
Cita Chicago (17th ed.)Perez, Delfin. "Steel Firm Was Bound to Fail." Manila Bulletin 1999.
Cita MLA (9th ed.)Perez, Delfin. "Steel Firm Was Bound to Fail." Manila Bulletin, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.