Barton, Simon (1997). Cambridge University Press, ed. The Aristocracy in Twelfth-Century León and Castile(en inglés). p. 94. «Fifteen complete aristocratic fueros from twelfth-century León and Castile have so far come to light. […] Those from Almaraz, Barruecopardo, Castrocalbón, Cifuentes de Rueda, Pozuelo de la Orden, Villalobos, Villalonso and Benafarces, Villarmildo, Villarratel and Villavaruz de Ríoseco are all Leonese.»
