1. Arthur Guirdham, The Great Heresy: the History and Beliefs of the Cathars, C. W. Daniel Company Ltd, Saffron Walden, 1993, p. 71.
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2. Malcolm Barber, The Cathars: Dualist Heretics in Languedoc in the High Middle Ages, Longman, London, 2000, p. 3; Zoe Oldenbourg, Massacre at Montsegur, Weidenfeld and Nicolson, London, 1997, pp. 128–129.
