Smyth, John (1883). Lives of the Berkeleys. Vol. 1. p. 224.
Smyth. Lives of the Berkeleys. p. 226.
Herbert, N.M. (1988). VCH Gloucestershire, vol. IV: The City of Gloucester. p. 20.
Smyth. Lives of the Berkeleys. p. 227.
Prestwich, Michael (2007). Plantagenet England 1225-1360. p. 241.
Smyth. Lives of the Berkeleys. p. 228.
Smyth. Lives of the Berkeleys. p. 232.
Wells-Furby, Bridget (2004). A Catalogue of the Medieval Muniments at Berkeley Castle. Vol. 17. Bristol & Gloucestershire Archaeological Society. p. xxxvi.
Smyth. Lives of the Berkeleys. pp. 238, 272.
Smyth. Lives of the Berkeleys. p. 243.
Smyth. Lives of the Berkeleys. pp. 245–6, 256.
Wells-Furby. Catalogue of the Medieval Muniments at Berkeley Castle. pp. 546–8.
Wells-Furby. Catalogue of the Medieval Muniments at Berkeley Castle. p. 549.
Wells-Furby. Catalogue of the Medieval Muniments at Berkeley Castle. p. xxxiv.
Smyth. Lives of the Berkeleys. pp. 272–3.
- Ancestral roots of certain American colonists who came to America before 1700, Frederick Lewis Weis, 1992, seventh edition.
- Ancestral roots of sixty colonists who came to New England 1623–1650. Frederick Lewis Weis (earlier edition).
- Magna Charta Sureties, 1215., Frederick Lewis Weis, Walter Lee Sheppard, Jr., William R. Beall, 1999, 5th Ed.
- Magna Charta Sureties, 1215", Frederick Lewis Weis, 4th Ed.
- The Complete Peerage, Cokayne.
- Burke's Peerage, 1938.
- Plantagenet Ancestry of Seventeenth-Century Colonists, David Faris, Genealogical Publishing Co., Inc., 1996.
- Royal Genealogy information held at University of Hull.
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