@book{145390,
	author = {Wang, Jichuan. and Xie, Haiyi. and ebrary, Inc.},
	title = {Multilevel models},
	publisher = {De Gruyter ;},
	year = {c2012.},
	address = {Berlin :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10527876}
}