@book{221884,
	author = {May, Tim. and ebrary, Inc.},
	title = {Social research},
	publisher = {McGraw Hill,},
	year = {2011.},
	address = {Maidenhead, England :},
	edition = {4th ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10481018}
}