@book{2066,
	author = {Levin, James Alan Fox Jack.},
	title = {Elementary statistics in social research /},
	publisher = {Pearson,},
	year = {2006.},
	series = {10th edition.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/8131704025/chopaconline-20}
}