Mathisen, M. E. (1981). Plio-Pleistocene geology of the central Cagayan Valley, northern Luzon, Philippines.
Cita Chicago (17th ed.)Mathisen, Mark Evan. Plio-Pleistocene Geology of the Central Cagayan Valley, Northern Luzon, Philippines. 1981.
Cita MLA (9th ed.)Mathisen, Mark Evan. Plio-Pleistocene Geology of the Central Cagayan Valley, Northern Luzon, Philippines. 1981.
Atenció: Aquestes cites poden no estar 100% correctes.