(1997). GSIS hikes pensions of gov't retirees. Manila Times.
Chicago Style aipamena"GSIS Hikes Pensions of Gov't Retirees." Manila Times 1997.
MLA aipamena"GSIS Hikes Pensions of Gov't Retirees." Manila Times, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.