Lua APA (7ú heag.)

Rivera, D. PetroEnergy, partners extend West Africa oil concession. The Philippine Star.

Lua i Stíl Chicago (17ú heag.)

Rivera, Danessa. "PetroEnergy, Partners Extend West Africa Oil Concession." The Philippine Star .

Lua MLA (9ú heag.)

Rivera, Danessa. "PetroEnergy, Partners Extend West Africa Oil Concession." The Philippine Star, .

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