@book{63096,
	author = {Zabala, José F. and Mesa, Enrique de,},
	title = {Excursiones a la Sierra de Guadarrama },
	publisher = {Imp. de Primitivo Fernández, },
	year = {[1191 (i.e. 1911)]},
	series = {Biblioteca de alpinismo ; },
	address = {Madrid : }
}