@book{101259,
	author = {Sierra i Fabra, Jordi},
	title = {La balada de Siglo XXI},
	publisher = {Editorial SiF, },
	year = {[Fecha de publicación no identificada]},
	address = {[Madrid, España] :},
	url = {https://public.digitaliapublishing.com/a/122933}
}