1. R.A. Goyer. Toxic effects of metals, in: Amdur, Doull, Klaassen (Eds.), Casarett and Doull's Toxicology: The Basic Science of Poisons, Pergamon, New York, 1991, pp. 623–680.
2. R.E. Menzer, Water and soil pollutants, in: Amdur, Doull, Klaassen (Eds.), Casarett and Doull's Toxicology: The Basic Science of Poisons, Pergamon, New York, 1991, pp. 872–902.
3. Cadmium uptake by moss, Calymperes dessertii;Low;Besch. Bioresour. Technol.,1991
4. WHO (World Health Organization), International Standards for Drinking Water, third ed., vol. 3, 1971, Geneva.