Baquiran, G.B., 1975, Notes on the geology and exploration of the Marian copper deposit, Cordon, Isabela: Journal of Geological Society of the Philippines, v. 29, no. 1, p. 19.
Knittel, U., 1987, The Cordon syenite complexAn undersaturated potassic igneous center in the Philippine Island Arc: Neues Jahrbuch Mineralogishe Abhandlungen, v. 157, no. 1, p. 5780.
Mitchell, A.H.G, and Leach, T.M., 1991, Epithermal gold in the PhilippinesIsland arc metallogenesis, geothermal systems and geology: London, Academic Press, 457 p.
Sillitoe, R.H., and Gappe, I.M., Jr., 1984, Philippine porphyry copper depositsGeologic setting and characteristics: Committee for Co-ordination of Joint Prospecting for Mineral Resources in Asian Offshore Areas (CCOP), CCOP Technical Publication 14, 89 p.
Singer, D.A., Berger, V.I., and Moring, B.C., 2008, Porphyry copper deposits of the worldDatabase and grade and tonnage models, 2008: U.S. Geological Survey Open-File Report 2008-1155,  p. and digital data, accessed December 31, 2013, at http://pubs.usgs.gov/of/2008/1155/.