C(okayne), Complete Peerage, sub "Gloucester."
C(okayne), (1887-1898); T.
C[okayne], Complete Peerage (1887-1898); W.
C(okayne)), Complete Peerage; corrigenda to vol.
C(okayne)'s Complete Peerage; Jeayes's Descriptive Catalogue of the Charters and Muniments at Berkeley Castle (1892); Dictionary of National Biography; Transactions of Bristol and Gloucestershire Archaeological Society, 3 vols., viii., xlv., et passim; The Red Book of the Exchequer, Chronicles of Roger of Wendover, Matthew Paris, Adam of Murimuth, Robert of Gloucester, Henry of Huntingdon, &c. (Rolls Series); British Museum Charters, &c. (0.