Lisa Margonelli, « Clean Energy's Dirty Little Secret », The Atlantic, (lire en ligne, consulté le )
usgs.gov
pubs.usgs.gov
(en) Jerry Chipman Olson, Daniel Reeves Shawe, Lloyd Charles Pray et William Neil Sharp, « Rare-Earth Mineral Deposits of the Mountain Pass District, San Bernardino County, California », U.S. Geological Survey Professional Paper, United States Government Publishing Office, no 261, (lire en ligne [PDF])