@book{5678,
	author = {Eco, Humberto and Gumper Melgosa, Carlos, },
	title = {¿En qué creen los que no creen? :},
	publisher = {Planeta,},
	year = {1999.},
	series = {Temas de Hoy},
	address = {Colombia :},
	edition = {1a ed.},
	note = {Incluye índice}
}