|
USA | |
| Barb, C. F. (1958) Some Colorado gem trails, Part 2: The Mineralogist, v. 26, no. 9, p. 198-201. |
| Maneotis: 2009 |
| Rocks and Minerals, Simon & Schuster 1978 |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
- Douglas Mountain Mining District
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |