1. ACGIH (1985b): “Particle Size-selective Sampling in the Workplace.” Cincinnati: American Conference of Governmental Industrial Hygienists.
2. ACGIH (1986): Documentation of the Threshold Limit Values and Biological Exposure Indices, 5th Ed. Cincinnati: American Conference of Governmental Industrial Hygienists.
3. ACGIH (1991): “Threshold Limit Values and Biological Exposure Indices for 1991–1992.” Cincinnati: American Conference of Governmental Industrial Hygienists.