1. R. Lewis, Hawley’s Condensed Chemical Dictionary, 12th Edition, Van Nostrand Reinhold, New York, 1993, p. 1174 and 1181.
2. American Conference of Governmental Industrial Hygienists (ACGIH), Documentation of the Threshold Limit Values and Biological Exposure Indices, 6th Edition, Cincinnati, OH, 1991.
3. National Institute for Occupational Safety and Health (NIOSH), Occupational Health Guidelines for Chemical Hazards, DHHS (NIOSH) Publication No. 81-123, Cincinnati, OH, 1981.
4. Occupational Safety and Health Administration (OSHA), Industrial Hygiene Field Operation Manual, OSHA Instruction CPL 2-2.20, Office of Field Coordination, 1979.
5. NIOSH Manual of Analytical Methods, Method 2010, 2nd Edition, Department of Health, Education and Welfare, Cincinnati, OH, 1989.