@book{204893,
	author = {Bethlehem, Jelke G. and Cobben, Fannie,},
	title = {Handbook of nonresponse in household surveys /},
	publisher = {Wiley,},
	year = {©2011.},
	series = {Wiley handbooks in survey methodology},
	address = {Hoboken, N.J. :},
	url = {http://onlinelibrary.wiley.com/book/10.1002/9780470891056}
}