Rivera, D. PetroEnergy, partners extend West Africa oil concession. The Philippine Star.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRivera, Danessa. "PetroEnergy, Partners Extend West Africa Oil Concession." The Philippine Star .
एमएलए (9वां संस्करण) प्रशस्ति पत्रRivera, Danessa. "PetroEnergy, Partners Extend West Africa Oil Concession." The Philippine Star, .
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