1. Sax N. Irving, Dangerous Properties of Industrial Materials, Fifth Edition, Section 1, Page 10, New York, 1979.
2. Plog B. A. (ed.), Fundamentals of Industrial Hygiene, Third Edition, pp. 457–458. National Safety Council, 1988 (originally published in 1971). Ironically, a contemporary example is the furthest removed from the grading of control methods in terms of preference: see The Occupational Environment—Its Evaluation, and Control, DiNardi S. P. (ed.), Chapter 31 by D. J. Burton, pp. 829–830, American Public Health Association, 1997.
3. Stellman J. M., Daum S., Work is Dangerous to Your Health, Chapter 9, pp. 290–326, Controlling Pollution in the Workplace, New York, 1971.