@book{43656,
	author = {Sheaffer, Craig C. and Moncada, Kristine M.},
	title = {Introduction to agronomy :},
	publisher = {Delmar Cengage Learning,},
	year = {c2012.},
	address = {Clfton Park, NY :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1312/2011935512-b.html}
}