@book{16740,
	author = {Reys, Robert and Reys, Robert E.},
	title = {Helping children learn mathematics.},
	publisher = {John Wiley & Sons,},
	year = {c2009.},
	address = {Hoboken, NJ :},
	edition = {9th ed. /},
	url = {http://www.loc.gov/catdir/enhancements/fy0910/2009419058-d.html}
}