@book{207086,
	author = {Saris, Willem E.},
	title = {Design, evaluation, and analysis of questionnaires for survey research /},
	publisher = {Wiley,},
	year = {2014.},
	series = {Wiley series in survey methodology},
	address = {Hoboken :},
	edition = {Second edition.},
	url = {http://onlinelibrary.wiley.com/book/10.1002/9781118634646}
}