1. B.J. Alloway, D.C. Ayres, Chemical Principles of Environmental Pollution, Chapman and Hall, Oxford, 1981.
2. W.C. Peters, Exploration and Mining Geology, Wiley, New York, 1978.
3. A.W. Rose, H.E. Hawkes, J.S. Webb, Geochemistry in Mineral Exploration, Academic Press, London, 2nd edition, 1979.
4. P. O'Neill, in: B.J. Alloway (Ed.), Heavy Metals in Soils, Blackie and Son, Glasgow, 1990.
5. D.J.A. Davies, B.G. Bennett, Exposure Commitment Assessments of Environmental Pollutants, vol. 3, Monitoring and Assessment Research Centre, London, 1983.