Cantar de mio Cid. Old Castilian text by RamonMenéndez Pidal. Modern Castilian prose versionby Alfonso Reyes. Prologue by Martin de Riquer.Edited by Juan Carlos Conde. Colección Austral,20. 19th edition. Madrid: Espasa Calpe, 1999. 525pp. ISBN 84-239-9866-5