Lua APA (7ú heag.)

Loyola, J. A. (1997). Petron reports 13% profit growth. Manila Bulletin.

Lua i Stíl Chicago (17ú heag.)

Loyola, James A. "Petron Reports 13% Profit Growth." Manila Bulletin 1997.

Lua MLA (9ú heag.)

Loyola, James A. "Petron Reports 13% Profit Growth." Manila Bulletin, 1997.

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