@book{210911,
	author = {Wunderlich, Gooloo S. and National Research Council (U.S.).},
	title = {Improving the measurement of late-life disability in population surveys},
	publisher = {National Academy Press,},
	year = {c2009.},
	address = {Washington, D.C. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10355554}
}