The Gibraltar Crusade Castile And The Battle For The StraitJoseph F. O'Callaghan · First published 2011Open the Tome
El rey sabio. El reinado de Alfonso X de CastillaJoseph F. O'Callaghan · First published 2000Open the Tome
Alfonso X, the Cortes, and government in medieval SpainJoseph F. O'Callaghan · First published 1998Open the Tome
The Spanish military order of Calatrava and its affiliatesJoseph F. O'Callaghan · First published 1975Open the Tome
