Cornea 28(5):520-3 [http://www.ncbi.nlm.nih.gov/pubmed/19421046] - Richard Isenring, Lars Neumeister, April 2011, 3rd edition; Paraquat: Unacceptable health risks for users; [http://www.evb.ch/cm_data/Paraquat_UnacceptableHealthRisk_3rdEdition_2011_6_2.pdf]
- Richard Isenring, Lars Neumeister, April 2011, 3rd edition; Paraquat: Unacceptable health risks for users; [http://www.evb.ch/cm_data/Paraquat_UnacceptableHealthRisk_3rdEdition_2011_6_2.pdf] 。