1. ACGIH, 1991. Documentation of the threshold limit values and biological exposure indices, sixth edn. ACGIH, Cincinnati.
2. ACGIH, 2000. TLVs and BEIs based on the documentations of the Threshold Limit Values for chemical substances and physical agents and Biological Exposure Indices. ACGIH, Cincinnati.
3. Filterable plasma concentration, glomerular filtration, tubular balance, and renal clearance of heavy metals and organic substances in metal workers;Araki;Arch. Environ. Health,1986
4. Hippuric acid and ortho-cresol as indices of toluene exposure;Baelum;Ann. Am. Conf. Ind. Hyg.,1985
5. Biological Monitoring of Toxic Metals;Clarkson,1988