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- [S25458533593] Complete Peerage, G E Cockayne et al, (St. Catherine Press, 29 Great Queen St, Kingsway, London 1910 on), Monthermer art, Vol IX, p. 142.
- [S25458533609] Testamenta Vetusta, Ed Nicholas Harris Nicolas, ( Nichols & Son, 1826), Will of Isabel countess of Warwick, pp. 239-240.
- [S25458533684] Tim Powys-Lybbe.
- [S25458533593] Complete Peerage, G E Cockayne et al, (St. Catherine Press, 29 Great Queen St, Kingsway, London 1910 on), Despenser art, Vol IV, p. 265.
- [S25458533593] Complete Peerage, G E Cockayne et al, (St. Catherine Press, 29 Great Queen St, Kingsway, London 1910 on), Monthermer art, Vol IX, p. 140 seq.
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