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ReferencesEdit

  1. Stratton, J.M. (1969). Agricultural Records. John Baker. ISBN 0-212-97022-4.
  2. 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/article/pii/0304418181900361. 
  3. Weber, N. "Petrobrusians". Catholic Encyclopedia. Retrieved January 27, 2013.