Reconquest and crusade in Spain. 1050-1150
in: Transactions of Royal Historical Society : Fifth series, v. (1987), issue 37: pp.31-47.
Edited by: Michele Bosco
Related Documents:
Pelayo. La Reconquista de España
Barcelona: Araluce, 1936.
Cristiani in armi. Da Sant'Agostino a papa Wojtila
Roma - Bari: Laterza, 2007.