@book{63984,
	author = {Nagel, Stuart S.},
	title = {Handbook of public policy evaluation},
	publisher = {Sage Publications},
	year = {2001},
	address = {Thousand Oaks (California, Estados Unidos)},
	url = {http://www.loc.gov/catdir/enhancements/fy0656/2001003378-t.html}
}