Roger I Trencavel (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Roger I Trencavel" in Spanish language version.

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Riley-Smith, 1997, p. 103. Riley-Smith, Jonathan (1997). The First Crusaders, 1095-1131. Cambridge University Press. (requiere registro).
Graham-Leigh, 2005, p. 42. Graham-Leigh, Elaine (2005). The Southern French Nobility and the Albigensian Crusade. The Boydell Press. ISBN 1-84383-129-5.
Graham-Leigh, 2005, p. 135. Graham-Leigh, Elaine (2005). The Southern French Nobility and the Albigensian Crusade. The Boydell Press. ISBN 1-84383-129-5.
Barber, 2005, p. 39. Barber, Malcolm (2005). «The Templar Preceptory of Douzens (Aude) in the Twelfth Century». En Bull, Marcus Graham; Léglu, Catherine, eds. The World of Eleanor of Aquitaine: Literature and Society in Southern France between the Eleventh and Thirteenth Centuries. The Boydell Press. ISBN 1-84383-114-7.
Barber, 2005, p. 46. Barber, Malcolm (2005). «The Templar Preceptory of Douzens (Aude) in the Twelfth Century». En Bull, Marcus Graham; Léglu, Catherine, eds. The World of Eleanor of Aquitaine: Literature and Society in Southern France between the Eleventh and Thirteenth Centuries. The Boydell Press. ISBN 1-84383-114-7.
Barber, 2005, p. 47. Barber, Malcolm (2005). «The Templar Preceptory of Douzens (Aude) in the Twelfth Century». En Bull, Marcus Graham; Léglu, Catherine, eds. The World of Eleanor of Aquitaine: Literature and Society in Southern France between the Eleventh and Thirteenth Centuries. The Boydell Press. ISBN 1-84383-114-7.
Pegg, 2008, p. 1. Pegg, Mark Gregory (2008). A Most Holy War: The Albigensian Crusade and the Battle for Christendom. Oxford University Press.