Philippine National Oil Company & Philippine National Oil Company-Energy Development Corporation. (1998). Philippine lighthouses. PNOC-EDC.
Cita Chicago (17th ed.)Philippine National Oil Company i Philippine National Oil Company-Energy Development Corporation. Philippine Lighthouses. [s.l.]: PNOC-EDC, 1998.
Cita MLA (9th ed.)Philippine National Oil Company i Philippine National Oil Company-Energy Development Corporation. Philippine Lighthouses. PNOC-EDC, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.