@book{200113,
	author = {Preker, Alexander S., and ebrary, Inc.},
	title = {Private voluntary health insurance in development},
	publisher = {World Bank,},
	year = {2006.},
	series = {Health, nutrition and population series},
	address = {Washington, DC :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10155143}
}