@book{1830,
	author = {Bluman, Allan G.},
	title = {Elementary statistics :a step by step approach. /},
	publisher = {McGraw-Hill,},
	year = {c2007.},
	address = {Boston :},
	edition = {6th ed.},
	note = {"Important formulas" (1 folded page) inserted.},
	url = {http://www.loc.gov/catdir/toc/ecip0517/2005023521.html}
}