"Toxic Waters: Regulatory Absence Allows Chemical, Coal and Farm Industries to Pollute US Water Supplies". "Democracy Now!" with Amy Goodman and Juan Gonzalez, www.democracynow.org. October 22, 2009.
Erasmus Darwin (1800). “Phytologia, or the philosophy of agriculture and gardening; with the theory of draining morasses and with an improved construction of the drill plough”, p.560