@book{12097,
	author = {Pratley, J. E.},
	title = {Principles of field crop production /},
	publisher = {Sydney University Press,},
	year = {1988.},
	address = {[Sydney] :},
	edition = {2nd. ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0639/90114741-d.html}
}