(2001). GSIS income increased by 42% on 1st quarter. Manila Bulletin.
Chicago Style (17. basım) Atıf"GSIS Income Increased by 42% on 1st Quarter." Manila Bulletin 2001.
MLA (9th ed.) Atıf"GSIS Income Increased by 42% on 1st Quarter." Manila Bulletin, 2001.
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