@book{67387,
	author = {Lynn, Peter, and ebrary, Inc.},
	title = {Methodology of longitudinal surveys},
	publisher = {John Wiley & Sons,},
	year = {2009.},
	series = {Wiley series in survey methodology},
	address = {Chichester, UK :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10300559}
}