Velasco, M. M. PetroEnergy income surges 180% to 6.55 M dollars. IN Business News. Manila Bulletin.
Chicago-viite (17. p.)Velasco, Myrna M. "PetroEnergy Income Surges 180% to 6.55 M Dollars. IN Business News." Manila Bulletin .
MLA-viite (9. p.)Velasco, Myrna M. "PetroEnergy Income Surges 180% to 6.55 M Dollars. IN Business News." Manila Bulletin, .
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