Nguồn Richard II, Công tước xứ Normandy

  • Crouch, David (2007). The Normans: The History of a Dynasty. Hambledon Continuum.
  • Douglas, David C. (1964). William The Conqueror. University of California Press.
  • Neveux, François (2008). A Brief History of The Normans. Constable and Robinson.
  • Potts, Cassandra (1997). Monastic Revival and Regional Identity in Early Normandy. The Boydell Press.
  • Searle, Eleanor (1988). Predatory Kinship and the Creation of Norman Power, 840-1066. University of California Press.
  • Van Houts, Elizabeth M.C. biên tập (1992a). The Gesta Normannorum Ducum of William of Jumièges, Orderic Vitalis, and Robert of Torigni. I. Clarendon Press.
  • Van Houts, E. biên tập (1992b). The Gesta Normannorum Ducum of William of Jumièges, Orderic Vitalis and Robert of Torigni. 2. Clarendon Press.
  • Van Houts, Elisabeth biên tập (2000). The Normans in Europe. Manchester University Press.