1. http://edis.ifas.ufl.edu/pi180 (Fisher, F.M., Pesticide use trends in the US: Global comparison)
2. http://emedicine.medscape.com/article/204178-overview (Denshaw-Burke, M., Methemoglobinemia)
3. http://en.wikipedia.org/wiki/ (Summaries for many materials, including atrazine, DDT, insecticides, sodium fluoroacetate, rodenticide, strychnine, hypervitaminosis D, zinc phosphide, Neem oil, copper toxicity, chlorothalonil)
4. http://ntp.niehs.nih.gov/%3Fobjectid%3DB9E4EB91-F1F6-975E-70AC7D4F36970595 (National Toxicology Program, executive summary of safety and toxicology information for Atrazine)
5. http://pmep.cce.cornell.edu/profiles/extoxnet/ (Toxicology summaries for many materials, including atrazine, paraquat, linuron, mancozeb, diuron, copper sulfate, chlorothalonil, and mancozeb)