I have a number of articles on the history of twelfth- and thirteenth-century Languedoc. Mostly these are available online, but unfortunately only with a university subscription or payment to the journal publisher.
The academic tome has its own page here.
Review of Antonio Sennis (ed.), Cathars in Question, (Heresy and Inquisition in the Middle Ages vol.4, York Medieval Press 2016), vii, 332pp on Medievally Speaking, 2017.
‘Justifying Deaths: The Chronicler Pierre des Vaux-de-Cernay and the Massacre of Beziers’, Mediaeval Studies vol.63 (2001), pp.283-303, online here.
‘Hirelings and Shepherds: Archbishop Berenguer of Narbonne (1191-1211) and the Ideal Bishop’, The English Historical Review vol. CXVI, no.469, (November 2001), pp.1083-1102, online here.
‘”The proconsul ruling in the city called Carcassonne”: memory, title and the Trencavel viscounts 1068-1209’, Historical Research vol.75, no.188, (May 2002), pp.170-187, online here.
‘Morts Suspectes et Justice Papale: Innocent III, Les Trencavel et la reputation de l’eglise’, La Croisade Albigeoise, Actes du Colloque du Centre d’Etudes Cathares, Carcassonne , 4, 5 et 6 octobre 2002, (Carcassonne 2004), pp.219-233.