Velasco, M. M. PNOC-EC, Shell set joint study of offshore west Palawan Basin. IN Business News. Manila Bulletin.
Lua i Stíl Chicago (17ú heag.)Velasco, Myrna M. "PNOC-EC, Shell Set Joint Study of Offshore West Palawan Basin. IN Business News." Manila Bulletin .
Lua MLA (9ú heag.)Velasco, Myrna M. "PNOC-EC, Shell Set Joint Study of Offshore West Palawan Basin. IN Business News." Manila Bulletin, .
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