Sources |
- [S25458533593] Complete Peerage, G E Cockayne et al, (St. Catherine Press, 29 Great Queen St, Kingsway, London 1910 on), Percy article, Vol X, p. 441.
- [S25458533641] II: Domesday Descendants, K S B Keats-Rohan, (Boydell Press, 2002), Willelm II de Percy, p. 631.
- [S25458533641] II: Domesday Descendants, K S B Keats-Rohan, (Boydell Press, 2002), Father, Ricardus II de Clare, pp. 398-9.
- [S25458533641] II: Domesday Descendants, K S B Keats-Rohan, (Boydell Press, 2002), Adelicia de Clare, p. 397.
- [S25458533684] Tim Powys-Lybbe.
- [S25458533593] Complete Peerage, G E Cockayne et al, (St. Catherine Press, 29 Great Queen St, Kingsway, London 1910 on), Percy art, Vol X, p. 435 seq.
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