The chronicle of Henry of Huntingdon, comprising the history of England, from the invasion of Julius Cæsar to the accession of Henry II. Also, The acts of Stephen, king of England and duke of Normandy, translated by Thomas Forrester, is available to read online
books.google.com
Bosworth, A Dictionary of the Anglo-Saxon Language, p. 286
Koch, Celtic culture: a historical encyclopedia, vol. 1–5, p. 641