@book{103309,
	author = {Berger, John, 1926-},
	title = {Dónde estamos?},
	year = {ene./mar. 2003},
	address = {La Habana},
	note = {Incluye nota},
	url = {http://www.jornada.unam.mx/2002/10/29/048n1con.php?origen=index.html}
}