@book{13855,
	author = {De Vaus, David. and NetLibrary, Inc.},
	title = {Surveys in social research /},
	publisher = {Routledge,},
	year = {2002.},
	series = {Social research today},
	address = {London :},
	edition = {5th ed.},
	note = {Previous ed.: London: UCL, 1996.}
}