@book{180899,
	author = {Tweeten, Luther G. and ebrary, Inc.},
	title = {Agricultural policy for the 21st century},
	publisher = {Iowa State Press,},
	year = {2002.},
	address = {Ames :},
	edition = {1st ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10296417}
}