@book{30018,
	author = {Stopher, Peter R.},
	title = {Collecting, managing, and assessing data using sample surveys.},
	publisher = {Cambridge University Press,},
	year = {2012.},
	address = {Cambridge, UK :},
	url = {http://www.loc.gov/catdir/enhancements/fy1208/2012382007-b.html}
}