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- [S336463] Medieval Lands: A prosopography of medieval European noble and royal families, Charles Cawley, (Online: The Foundation for Medieval Genealogy at http://fmg.ac/Projects/MedLands/, 20XX), http://fmg.ac/Projects/MedLands/AQUITAINE.htm#GuillaumeXAquitainedied1137.
- [S422] Richard I (English Monarchs Series), John Gillingham, (New Haven: Yale University Press, 1999), 29-30.
"William IX of Aquitaine, had married Philippa, the only child of Count William IV of Toulouse. Philippa was ousted by her uncle, William IV's younger brother, but in the eyes of her descendants she had been the rightful countess of Toulouse and periodically they went to war to reasset that claim."
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