@book{153321,
	author = {Carr, Susan, and Unwin, Nigel, and ebrary, Inc.},
	title = {An introduction to public health and epidemiology},
	publisher = {Open University Press,},
	year = {2007.},
	address = {Maidenhead :},
	edition = {2nd ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10229817}
}