@book{1553,
	author = {Caldwell, Sally.},
	title = {Statistics unplugged /},
	publisher = {Thomson Wadsworth,},
	year = {c2007.},
	address = {Belmont, CA :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1515/2005937465-b.html}
}