Haxel, G.B., Budahn, J.R., Fries, T. L., King, B. W., White, L. D., and Aruscavage, P. J., 1987, Geochemistry of the protolith of the Orocopia schist, southeastern California; and tectonic inferences, in Dickinson, W. R., and Klute, M. A., eds., Mesozoic geology of southern Arizona and adjacent areas: Arizona Geological Society Digest, v. 18, p. 49-64.
