@book{39148,
	author = {Rugg, Gordon. and ebrary, Inc.},
	title = {Using statistics},
	publisher = {McGraw Hill/Open University Press,},
	year = {2007.},
	series = {Open up study skills},
	address = {Maidenhead, England ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10229869}
}