Perez, D. (1999). Steel firm was bound to fail. Manila Bulletin.
Cita Chicago Style (17a ed.)Perez, Delfin. "Steel Firm Was Bound to Fail." Manila Bulletin 1999.
Cita MLA (9a ed.)Perez, Delfin. "Steel Firm Was Bound to Fail." Manila Bulletin, 1999.
Precaución: Estas citas no son 100% exactas.