books.google.comhttp://books.google.com/books/about/Polychronicon_Ranulphi_Higden_monachi_Ce.html?hl=nl&id=2lQJAAAAQAAJ&q=HIGDEN&utm_source=gb-gplus-sharePolychronicon Ranulphi Higden monachi Cestrensis: Book the fifth, cap. 13-33 ; Book the sixth, cap. 1-9