Heirbout, D.  (2009).  Not European Feudalism, but Flemish Feudalism: A New Reading of Galbert of Bruges?s Data on Feudalism in the Context of Early Twelfth-Century Flanders. In J.  Rider & Murray, A. V. (Red.), Galbert of Bruges and the Historiography of Medieval Flanders (pp. 56-88). Washington: Catholic University of America Press.