Freibergite Subgroup from Park County, Colorado, USA
USA | |
| Kosnar, Richard A. (1979) Famous Mineral Localities: The Home Sweet Home Mine [Colorado]. The Mineralogical Record, 10 (6) 333-338 |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |