@book{198361,
	author = {Heddens, James W. and Speer, William R.},
	title = {Today's mathematics},
	publisher = {Wiley},
	year = {c2006.},
	series = {Wiley/Jossey-Bass education},
	address = {Hoboken, NJ},
	edition = {11th ed.},
	note = {ESTE LIBRO INCLUYE UN DISCO}
}