S. Sataray, J. B. Baker and S. Curbenjapol, “A Global Perspective on Cadimium Pollution and Toxicity in Non-Occupationally Exposed Population,” Toxicology Letters, Vol. 137, No. 1-2, 2003, pp. 65-83. doi:10.1016/S0378-4274(02)00381-8
 N. Ercal, O. Gurer and B. Aykin, “Toxic Metals and Oxidative Stress, Part 1: Mechanisms Involved in Metal Induce Oxidative Damage,” Current Topics Medicinal Che- mistry, Vol. 1, No. 6, 2001, pp. 529-539. doi:10.2174/1568026013394831
 E. O. Farombi, O. A. Aclelowo and Y. R. Ajimoko, “Bio-markers of Oxidative Stress and Heavy Metal Levels as Indicators of Environmental Pollution in African Cat Fish from Nigeria Ogun River,” International Journal of Environment Research and Public Health, Vol. 4, No. 2, 2007, pp.158-165. doi:10.3390/ijerph2007040011
 Occupational Health and safety administration safety and health topics, 2008. http.//www.osha.gov/SLTCmetalsheavyindex.html
 Agency for Toxic Substances and Disease Registry, “*,” Tox FAQS, 2008. http//www.astdr.gov/Tox.fag.html
 M. J. Stillman and A. Presta, “Characterizing Metal Ion Interaction with Biological Molecules—The Spectroscopy of Metallothionine,” Journal of Editors Molecular Biology and Toxicology of Metal, Vol. *, No. *, 2000, pp. 276-290.
 S. S. Vutukuru, “Acute Effects of Hexavalent Chromium on Survival, Oxygen Consumption, Hematological Parameters and Some Biochemical Profiles of IndIan Major Carp, Labeo Rohita,” International Journal of Environmental Public Health, Vol. 2, No. 3, 2005, pp. 456-462. doi:10.3390/ijerph2005030010
 C. A. Bache, “Cadimium and Nickel in Main Steam Particulate of Cigarattes Containing Tobacco Grown on a Low-Cadimium Soil-Sluge Mixture,” Journal of Toxcology and Environmental Health, Vol. 16, 1985, pp. 547- 552.
 A. Sukumar and R. Subramaniam, “Elements in Hair and Nails of Risidents from Avillage Adjacent to New Delhi Influence of Place of Occupation and Smoking Habits,” Biological Trace Element Research, Vol. 34, No. 1, 1992, pp. 99-105. doi:10.1007/BF02783902
 P. Paakko, P. Kokkonen, S. Anttila, and P. L. Kalliom?ki, “Cadimium and Chromium as Markers of Smoking in Human Lung Tissue,” Environmental Research, Vol. 49, No. 2, 1989, pp. 197-207. doi:10.1016/S0013-9351(89)80065-9
 M. Wolfsperger, G. Hauser, W. G?blerc and C. Schlagenhaufen, “Heavy Metals in Human Hair Sample from Austria and Italy Influence of Smoking Habit,” Science of the Total Environment, Vol. 156, No. 3, 1994, pp. 235-239. doi:10.1016/0048-9697(94)90190-2