@book{63102,
	author = {Zabala, José F. and González, Ramón.},
	title = {Excursiones a la Sierra de Guadarrama },
	publisher = {Imp. de Primitivo Fernández, },
	year = {[1911?]},
	series = {Biblioteca turista de España automóvil},
	address = {Madrid : }
}