@book{136549,
	author = {Princeton University. Center for Energy and Environmental Studies},
	title = {Leaded gasoline phase-out},
	publisher = {Princeton University. Center for Energy and Environmental Studies},
	year = {2001},
	address = {New Jersey},
	note = {Página visitada en junio de 2002. ; Navegadores de Internet},
	url = {http://www.princeton.edu/%7Evmthomas/pbgas.html}
}