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ReferencesEdit

  1. McGrank, Lawrence (1981). "Norman crusaders and the Catalan reconquest: Robert Burdet and te principality of Tarragona 1129-55". Journal of Medieval History 7 (1): 67–82. http://www.sciencedirect.com/science/article/pii/0304418181900361. 
  2. Kleinhenz, Christopher (2004). Medieval Italy: an encyclopedia, Volume 1. New York: Routledge. ISBN 0-415-93930-5.