@book{68723,
	author = {Ridley, D. D. and ebrary, Inc.},
	title = {Information retrieval},
	publisher = {Wiley,},
	year = {2009.},
	address = {Hoboken, N.J. :},
	edition = {2nd ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10331490}
}