W. Farrer, 'XXII. Greystoke Fee', in Early Yorkshire Charters, 4 vols (Editor/Ballantyne, Hanson & Co, Edinburgh 1915), II, pp. 505-26 (Internet Archive); Calendar of Patent Rolls, Edward I AD 1292-1301 (HMSO, London 1895), pp. 303-04 and p. 340 (Internet Archive).
Calendar of Close Rolls, Edward I, V: AD 1302-1307 (HMSO 1908), p. 420 and p. 494 (Internet Archive).
I'Anson, 'The Mediaeval Military Effigies of Yorkshire, Part II', Yorkshire Archaeological Journal XXIX (1927), pp. 1-67, pp. 6-9, at p. 8, note 3, and Pl. XII, Fig. 61 (Internet Archive).
J.E.E.S. Sharp and A.E. Stamp, '51. Inquisition of Robert son of Ralph', in Calendar of Inquisitions Post Mortem and Other Analogous Documents, VI (HMSO 1910), pp. 26-33 (Internet Archive); 'Morpeth Miscellanea', in J. Hodgson, A History of Northumberland, in Three Parts, Part 2, volume 2 (Author, Newcastle 1832), at pp. 473-74 (Google).
Calendar of the Close Rolls, Edward III VI: 1341-1343 (HMSO, London 1902), p. 642 (Internet Archive).
Calendar of Close Rolls AD 1323-1327 (HMSO 1898), p. 38 (Internet Archive).
'345. (Inquisition to find the age of) William, son and heir of Ralph de Creystok', in J.E.E.S. Sharp and A.E. Stamp (eds), Calendar of Inquisitions Post Mortem and Other Analogous Documents, VIII: Edward III (HMSO 1913), p. 238 (Internet Archive).
Calendar of Close Rolls, Edward II, AD 1323-1327 (HMSO 1898), pp. 14-15 and pp. 48-49 (Internet Archive).
J. Raine and J.W. Clay (eds), Testamenta Eboracensia Vol. 4, Surtees Society Vol. LIII (1868), p. 20, note (Internet Archive).
'668. Inquisition of Elizabeth, late the wife of Robert son of Ralph..., De Craystock', in J.E.E.S. Sharp and A.E. Stamp (eds), Calendar of Inquisitions Post Mortem and Other Analogous Documents, VIII: Edward III (HMSO 1913), pp. 496-98 (Internet Archive).
books.google.com
C.H. Hunter Blair, 'Seals of Northumberland and Durham', Archaeologia Aeliana, 3rd Ser., XX (1923), pp. 69-186, item no. 328, at p. 150. John Ravilious and Douglas Richardson show that Elizabeth was daughter of Robert Nevill of Scotton, and not of Ralph Nevill as stated in 'Additions to Dugdale's Baronage', Collectanea Topographica et Genealogica V (John Bowyer Nichols and Son, London 1838), pp. 313-17 (Google), at p. 315. See D. Richardson, ed. Kimberley, Plantagenet Ancestry: A Study in Colonial and Medieval Families 2nd Edition (Salt Lake City, 2011), II, p. 173 ff. (Google).
J.E.E.S. Sharp and A.E. Stamp, '51. Inquisition of Robert son of Ralph', in Calendar of Inquisitions Post Mortem and Other Analogous Documents, VI (HMSO 1910), pp. 26-33 (Internet Archive); 'Morpeth Miscellanea', in J. Hodgson, A History of Northumberland, in Three Parts, Part 2, volume 2 (Author, Newcastle 1832), at pp. 473-74 (Google).