1. R. Carson, Silent Spring, Houghton Mifflin, Boston, MA, 1962.
2. R.I. Krieger, in H. Witschi (Ed.), The Scientific Basis of Toxicity Assessment, Elsevier/North-Holland, New York, 1980, p. 15.
3. TSCA Handbook, Second Edition, Government Institutes, Rockville, MD, 1990, p. 1.