@book{134788,
	author = {Snapp, Sieglinde S. and Pound, Barry.},
	title = {Agricultural systems :},
	publisher = {Elsevier/Academic Press,},
	year = {c2008.},
	address = {Boston :},
	url = {http://www.loc.gov/catdir/toc/ecip084/2007045787.html}
}