Calumpita, R. E. (2004). GSIS employees join call for ouster of their boss. Manila Times.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCalumpita, Ronnie E. "GSIS Employees Join Call for Ouster of Their Boss." Manila Times 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCalumpita, Ronnie E. "GSIS Employees Join Call for Ouster of Their Boss." Manila Times, 2004.
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