Barton 1992, p. 249. Barton, Simon (1992). "Two Catalan magnates in the courts of the kings of León-Castile: the careers of Ponce de Cabrera and Ponce de Minerva re-examined". Journal of Medieval History. 18 (18): 233–266. doi:10.1016/0304-4181(92)90022-Q.
Barton 1992, pp. 248–249. Barton, Simon (1992). "Two Catalan magnates in the courts of the kings of León-Castile: the careers of Ponce de Cabrera and Ponce de Minerva re-examined". Journal of Medieval History. 18 (18): 233–266. doi:10.1016/0304-4181(92)90022-Q.
Barton 1992, p. 264. Barton, Simon (1992). "Two Catalan magnates in the courts of the kings of León-Castile: the careers of Ponce de Cabrera and Ponce de Minerva re-examined". Journal of Medieval History. 18 (18): 233–266. doi:10.1016/0304-4181(92)90022-Q.