@book{30112,
	author = {Berceo, Gonzalo de,},
	title = {Coleccion de poesias castellanas anteriores al siglo XV :},
	publisher = {por don Antonio de Sancha :},
	year = {1779-1790},
	address = {En Madrid :},
	note = {Data vol. 1: 1779; vol. 2: 1780; vol. 3: 1782; vol. 4: 1790},
	url = {http://books.google.com/books?vid=BNC:1001986836&hl=ca&printsec=frontcover}
}