1. Trace Elements in the Terrestrial Environment;Adriano,1986
2. The significance of trace metal speciation for water, sediment and soil quality criteria and standards
3. Alloway, B. J. (2008). Zinc in soils and crop nutrition, second ed. International Zinc Association and International Fertilizer Industry Association. Brussels and Paris. http://www.zinc-crops.org (accessed 26 February, 2014).
4. Counting the Zinc-Proteins Encoded in the Human Genome