[http://ipmworld.umn.edu/chapters/pimentel.htm]
[http://www.ncbi.nlm.nih.gov/pubmed/12594778]
[http://www.biomedcentral.com/1471-2377/8/6/abstract]. See also [http://www.sourcewatch.org/index.php?title=Monsanto_and_the_Roundup_Ready_Controversy#Herbicide_in_Your_Food].
Pesticide Action Network has created a searchable database, [http://www.whatsonmyfood.org/index.jsp What's on my food], that one can use to easily find out which pesticides and pesticide residues are used on and remain on everyday fruits, vegetables, milk and meat.