Sionil, F. C. (2002). GSIS quarter profits up from P15.31B to P21.75B. Manila Bulletin.
Chicagoスタイル(17版)引用形式Sionil, Fil C. "GSIS Quarter Profits Up from P15.31B to P21.75B." Manila Bulletin 2002.
MLA(9版)引用形式Sionil, Fil C. "GSIS Quarter Profits Up from P15.31B to P21.75B." Manila Bulletin, 2002.
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