1. Ademoroti, C. M. A. (1996). Environmental chemistry and toxicology (pp. 171–204). Ibadan: Foludex Press.
2. Ercal, N., Gurer-Orhan, H., & Aykin-Burns, N. (2001). Toxic metals and oxidative stress part I: Mechanisms involved in metal-induced oxidative damage. Current Topics in Medical Mycology, 1(16), 529–539.
3. Food and Drug Directorate (1990). Heavy metal determination in food drinks. Ottawa, Canada: Department of National Health and Welfare.
4. Forner, U. A., & Wittman, G. W. (1993). Metal pollution in aquatic environment (p. 486). Berlin: Springer.
5. Goyer, R. A., & Thomas, W. C. (2001). In Casarett and Doull’s toxicology. The basic science of poisons (p. 1236). McHrawHill.