C. Roberts (ed.), Calendarium Genealogicum: Henry III and Edward I, Rolls Series, 2 vols. (London: Longmans, Green, Reader and Dyer, 1865), II, p. 515 (Hathi Trust); Calendar of Fine Rolls, I: Edward I, 1272-1307 (HMSO 1911), p. 377.
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Calendar of Patent Rolls, Edward I AD 1292-1301, p. 340 (Internet Archive).
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N. H. Nicolas, The Siege of Carlaverock in the XXVIII Edward I. AD MCCC (J. B. Nichols and Son, London 1828), pp. 162-64 (Internet Archive).
W. M. I'Anson, 'The Mediaeval Military Effigies of Yorkshire, Part II', Yorkshire Archaeological Journal XXIX (1927), pp. 1-67, at pp. 6-8, and Pl. XII, Fig. 59 (Internet Archive).
E. Scott-Ellis, J. Foster and Howard de Walden, Some Feudal Lords and their Seals, MCCCI (Seaford (Sussex): De Walden Library, 1904), p. 175 (Internet Archive).
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F. Palgrave (ed.), The Parliamentary Writs and Writs of Military Summons (Command, Westminster 1827), I, p. 648 (Google).
S. Jefferson, The History and Antiquities of Cumberland: with Biographical Notices and Memoirs, I - Leath Ward (S. Jefferson, Carlisle/J. B. Nichols and Son, London/E. Charnley, Newcastle 1840), pp. 338-45 (Google).
W. S. Gibson, The History of the Monastery Founded at Tynemouth, in the Diocese of Durham (London: William Pickering, 1846), I, p. 134 and II, p. cx (Google).
C. H. Hunter Blair, 'Seals of Northumberland and Durham', Archaeologia Aeliana, 3rd Ser., XX (1923), pp. 69-186, item no. 328, at p. 150; D. Richardson, ed. Kimberley, Plantagenet Ancestry: A Study in Colonial and Medieval Families 2nd edition (Salt Lake City, 2011), II, p. 173 ff. (Google).
C. Roberts (ed.), Calendarium Genealogicum: Henry III and Edward I, Rolls Series, 2 vols. (London: Longmans, Green, Reader and Dyer, 1865), II, p. 515 (Hathi Trust); Calendar of Fine Rolls, I: Edward I, 1272-1307 (HMSO 1911), p. 377.
'Additions to Dugdale's Baronage', p. 314; also Calendarium Genealogicum, II, p. 713 (Hathi Trust)