1. ACGIH(1998) American Conference of Governmental Industrial Hygienists. Threshold Limit Values (TLVs) for Chemical Substances and Physical Agents Biological Exposure Indices for 1998. Cincinnati OH.
2. ACGIH(2001) American Conference of Governmental Industrial Hygienists. Threshold Limit Values (TLVs) for Chemical Substances and Physical Agents Biological Exposure Indices for 2001. Cincinnati OH.
3. X-ray fluorescence analysis of lead in human skeleton in vivo.
4. Evaluation of trace elements in wheat and wheat by‐products;Ahmad S;J AOAC Int,1994
5. Heavy metal accumulation in sediment and freshwater fish in U.S. Arctic lakes