@book{6455,
	author = {Kalof, Linda. and Dan, Amy. and ebrary, Inc.},
	title = {Essentials of social research},
	publisher = {McGraw Hill/Open University Press,},
	year = {2008.},
	address = {Maidenhead ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10274049}
}