1. The Code of Federal Regulations, 40 CFR § 180.6; Published by the Office of the Federal Register National Archives and Records Administration.
2. Pesticide Chemical News Guide, October 1, 1993: 1101 Pennsylvania Ave., S. E., Washington D. C.
3. Association of Offical Analytical Chemists book of Official Methods of Analysis 15th Ed. 1990, AOAC International, Arlington, VA, Section 970.52.
4. Pesticide Analytical Manual, Vol. 1, 3rd Edition 1994, Section 304-11, U. S. Department of Health and Human Services, Food and Drug Administration
5. Pesticide Residues in Composited Milk Collected Through the U.S. Pasteurized Milk Network