@book{53152,
	author = {Greiff, León de, 1895-1976},
	title = {Ritornelo},
	year = {31 mar. 1966},
	address = {Guayaquil},
	note = {Incluye datos sobre el autor},
	url = {http://es.diarioinca.com/2009/02/poema-ritornelo-leon-de-greiff.html}
}