@book{58158,
	author = {Magdoff, Fred,},
	title = {Soil organic matter in sustainable agriculture /},
	publisher = {CRC Press,},
	year = {c2004},
	address = {Boca Raton :},
	url = {http://www.loc.gov/catdir/enhancements/fy0646/2004043574-d.html}
}