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William J Courtenay. Changing Approaches to Fourteenth-Century Thought. Pontifical Institute of Mediaeval Studies. 2007. (Etienne Gilson series, volume 29).
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Stephen F Brown, Thomas Dewender and Theo Kobusch (eds). Philosophical Debates at Paris in the Early Fourteenth Century. Brill. Leiden and Boston. 2009.
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^His date of birth is also given as 1246 and 1250.
^Szpiech, Ryan (2006). From Testimonia to Testimony: Thirteenth-Century Anti-Jewish Polemic and the Mostrador de justicia of Abner of Burgos/Alfonso of Valladolid. Dissertation, Yale University.
hdl:
2027.42/64011.