Perez, D. (1999). Steel firm was bound to fail. Manila Bulletin.
Chicagoスタイル(17版)引用形式Perez, Delfin. "Steel Firm Was Bound to Fail." Manila Bulletin 1999.
MLA(9版)引用形式Perez, Delfin. "Steel Firm Was Bound to Fail." Manila Bulletin, 1999.
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