@book{34840,
	author = {Sirkin, R. Mark.},
	title = {Statistics for the social sciences /},
	publisher = {Sage Publications,},
	year = {c2006.},
	address = {Thousand Oaks, Calif. :},
	edition = {3a ed.},
	url = {http://www.loc.gov/catdir/toc/ecip059/2005007296.html}
}