Kurt Eichenwald, The Informant: A True Story New York: Broadway/Random House (movie tie-in edition), 2009:

James B. Lieber, Rats in the Grain: The dirty tricks and trials of Archer Daniels Midland Four Walls Eight Windows, 2000.

John M. Connor, Archer Daniels Midland: Price-Fixer to the World (Fourth Edition) Purdue University, Department of Agricultural Economics, 2000.

Richard Manning, Against the Grain: How Agriculture Has Hijacked Civilization (paperback), North Point Press, 2005.

UK Food Group, "Food Inc. Corporate concentration from farm to consumer" (2003).

William Heffernan and Mary Hendrickson, U. of Missouri, "Multi-National Concentrated Food Processing and Marketing Systems and The Farm Crisis," (Presentation at the American Association for Advancement of Science, 2002)

Links:
Archer Daniels Midland (corporate website): http://www.adm.com
Crocodyl Profile of ADM: http://www.crocodyl.org/wiki/archer_daniels_midland