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USA | |
| Witkind, I.J. & R.E. Thaden (1963), Geology and uranium-vanadium deposits in the Monument Valley area, Apache & Navajo Cos., AZ, USGS Bull. 1103: 57. |
| www.koeln.netsurf.de/~w.steffens/usa.htm |
| Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM. |
| Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM. |
| Corey, A. S. (1958). Petrography of the uranium and vanadium ores of the Nelson Point No. 1 mine, San Juan County, New Mexico (Doctoral dissertation, Colorado Mesa University. Tomlinson Library). |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |