@book{1100,
	author = {Giller, K. E.},
	title = {Nitrogen fixation in tropical cropping systems /},
	publisher = {CABI Pub.,},
	year = {c2001.},
	address = {Wallingford, Oxon, UK ;},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0610/00063026-d.html}
}