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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/ENGLISH%20NOBILITY%20MEDIEVAL.htm#RogerBigodNorfolkdied1270.
- [S336470] Wikipedia, (Online: https://en.wikipedia.org), "Roger Bigod, 4th Earl of Norfolk," http://en.wikipedia.org/wiki/Roger_Bigod,_4th_Earl_of_Norfolk.
- [S421] The Greatest Knight: The Remarkable Life of William Marshal, the Power Behind Five English Thrones, Thomas Asbridge, (New York: HarperCollins, 2014), 311.
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