Keith, W.J., Goldfarb, R.J., Bankey, V.L., Jones, S.L., and Korzeb, S.L., 1989, Mineral resources of the Sierra Estrella Wilderness Study Area, Maricopa County, Arizona, Chapter I, in Mineral resources of Wilderness Study Areas: Southwestern and south-central Arizona: U.S. Geological Survey Bulletin 1702-I, p. I1-I14.
