W. H. Turner and H. O. Coxe, Calendar of charters and rolls preserved in the Bodleian library (Oxford, 1878) [annotated copy, Bodleian Library R.Ref.741], 165 [Google Books]
J. Gilbert Wiblin, Handlist 339e. Seals (including casts and matrices), May 1916 (unpublished handlist, Bodleian Library), p. 83