1. 2007 http://www.cfra.org/sites/www.cfra.org/files/Dorgan-Grassley-Sign-On-Letter.pdf
2. Subsidies with Responsibilities: Placing Stewardship and Disclosure Conditions on Government Payments to Large-Scale Commodity Operations;Breggin;Harvard Environmental Law Review,2013
3. Environmental Working Group. 2012a Crop Insurance in the United States: New Data-Insurance Subsidies to Individual Policy-Holders http://farm.ewg.org/cropinsurance.php
4. Environmental Working Group. 2012b Total Costs by Crop in the United States http://farm.ewg.org/cropinsurance.php?fips=00000&summpage=TC_BY_CROP&statename=theUnitedStates
5. Environmental Working Group. 2012c Concentration of Premiums Subsidies in the United States, 2011 http://farm.ewg.org/cropinsurance.php?fips=00000&summpage=CONC2011&statename=theUnitedStates