@book{19868,
	author = {Herren, Ray V.},
	title = {The science of agriculture :},
	publisher = {Delmar, Cengage Learning,},
	year = {c2012.},
	address = {Clifton Park, NY :},
	edition = {4th ed.},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy1212/2010941450-d.html}
}