1. American Conference of Governmental Industrial Hygienists (1986): “Documentation of the Threshold Limit Values and Biological Exposure Indices,” 5th Ed. Cincinnati: American Conference of Governmental Industrial Hygienists.
2. American Conference of Governmental Industrial Hygienists (1988): “Threshold Limit Values and Biological Exposure Indices for 1988–1989.” Cincinnati: American Conference of Governmental Industrial Hygienists.
3. Bureau of National Affairs, Inc. (1985a): Wirth, Waxman, Florio offer legislation to force EPA regulation of 85 substances. Environ Rep, May 31, 1985: 194–195, 273.