Almogela (1974); Sillitoe and Gappe (1984); Singer and others (2008)
Hammarstrom and others (2014)
Almogela, D.H., 1974, Geologic environment and economic possibilities of porphyry copper deposits in the Philippines: Geological Society of the Philippines Journal, v. 28, no. 3, p. 116.
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.