@book{130207,
	author = {Campión, Arturo. and Zinkunegui, José de.},
	title = {Opera vasca },
	publisher = {Tall. Gráf. Icharopena, },
	year = {1963.},
	address = {Zarauz : },
	note = {Edición bilingüe en español y vascuence.}
}