References for Henry 6/14th Earl, 1st Duke, King de Beauchamp * of Warwick * of Warwick * of the Isle of Wight
Sir B.Burke:
The Dormant and Extinct Peerage.
London, 1866
F.M.Powicke, E.B.Fryde:
Handbook of British Chronology.
London, 1961
Burke?:
?.