|
USA | |
| Cox, D.P. (1985) Geology of the Tanama and Helecho porphyry copper deposits and vicinity, Puerto Rico. Professional Paper 1327. US Geological Survey doi:10.3133/pp1327 |
| American Mineralogist 28:215-232 |
| Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 661. |