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Lua i Stíl Chicago (17ú heag.)Velasco, Myrna M. "NPC Debt Swells to $5.7B; Privatization Plan Stalled?" Manila Bulletin 1999.
Lua MLA (9ú heag.)Velasco, Myrna M. "NPC Debt Swells to $5.7B; Privatization Plan Stalled?" Manila Bulletin, 1999.
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