@book{41621,
	author = {Kinnear, Paul R. and Gray, Colin D.},
	title = {SPSS 15 made simple /},
	publisher = {Psychology Press,},
	year = {2007.},
	address = {New York NY :},
	url = {http://www.loc.gov/catdir/toc/ecip0720/2007024118.html}
}