1. Hathaway, G. J., Proctor, N. H. and Hughes, J. P. 1996.Proctor and Hughes' Chemical Hazards of the Workplace, 4th ed., pp. 96–97. New York: John Wiley & Sons, Inc.
2. Hathaway, G. J., Proctor, N. H. and Hughes, J. P. 1996.Proctor and Hughes' Chemical Hazards of the Workplace, 4th ed., p. 563New York: John Wiley & Sons, Inc.
3. Hathaway, G. J., Proctor, N. H. and Hughes, J. P. 1996.Proctor and Hughes' Chemical Hazards of the Workplace, 4th ed., p. 232New York: John Wiley & Sons, Inc.
4. 2001.Code of Federal Regulations, 29 CFR 1910.1000(Z)