Álvarez Borge, Ignacio. 2010. “Vassals, Office-Holders, Clients, and Relatives: Hierarchy and Inter-Noble Relationships in Medieval Castile (c. 1100-C. 1350) As Reflected in the Documentary Sources”. Hispania 70 (235):359-90. https://doi.org/10.3989/hispania.2010.v70.i235.320.