Torrevillas, Z. (1999). Natural gas development a milestone in the nation's history. Philippine Star.
Cita Chicago (17th ed.)Torrevillas, Zonito. "Natural Gas Development a Milestone in the Nation's History." Philippine Star 1999.
Cita MLA (9th ed.)Torrevillas, Zonito. "Natural Gas Development a Milestone in the Nation's History." Philippine Star, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.