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Lua i Stíl Chicago (17ú heag.)Perayco, Sheila Samonte. "GSIS Reinsurance Monopoly: World's Top Brokers to Overprice." Philippine Star 2001.
Lua MLA (9ú heag.)Perayco, Sheila Samonte. "GSIS Reinsurance Monopoly: World's Top Brokers to Overprice." Philippine Star, 2001.
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