1. Donaldson, D., Kiely, T., and Grube, A.Pesticide Industry Sales and Usage: 1998 and 1999 Market Estimates
2. EPA-733-R-02-001;United States Environmental Protection Agency:Washington, DC, 2002.
3. Urinary Paranitrophenol, a Metabolite of Methyl Parathion, in Thai Farmer and Child Populations
4. Data from Table 3.9 athttp://www.epa.gov/opp00001/pestsales/07pestsales/usage2007_3.htm#3_8(accessed May 14, 2013).