Clapp, R.W., Howe, K.H, and Jacobs, M.M., 2005. Environmental and occupational causes of cancer, www.sustainableproduction.org

Plant, J.A., Turner, K.T., and Highley, D.E., 1998. Minerals and the environment. Proceedings of Minerals '98 Conference, June 1998: Republished in the Mineralogical Society Bulletin, No. 119, July 1998, 3–11; Mineral Planning 77, December 1998, 3–8; IM&M Journal, December 1998, 1, 12, 331–336.