Perez, D. (1999). Steel firm was bound to fail. Manila Bulletin.
Chicago Style (17. basım) AtıfPerez, Delfin. "Steel Firm Was Bound to Fail." Manila Bulletin 1999.
MLA (9th ed.) AtıfPerez, Delfin. "Steel Firm Was Bound to Fail." Manila Bulletin, 1999.
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