Columbia subject headings:
Cid, approximately 1043-1099--Bibliography.
Cid, approximately 1043-1099.
Harvard subject headings:
Cid (Epic cycle)
Cid (Epic cycle)--Bibliography.
Cid, approximately 1043-1099--Romances--History and criticism.
Princeton subject headings:
El Cid Campeador--Bibliography.
El Cid Campeador.