The Albigensian Crusade on the Web

Societe de l'Oriflamme:  http://www.xenophongroup.com/montjoie/albigens.htm

Cathar.info:  http://www.cathar.info/1206_crusade.htm

Wikipedia:  https://en.wikipedia.org/wiki/Albigensian_Crusade

Crusades Wiki:  http://crusades.wikia.com/wiki/Albigensian_Crusade

Encyclopaedia Brittanica:  http://www.britannica.com/EBchecked/topic/12976/Albigensian-Crusade

Catholic Encyclopedia Online:  http://www.newadvent.org/cathen/01267e.htm

The On-line Reference Book for Medieval Studies:  http://www.the-orb.net/textbooks/crusade/albig.html
 

On Cathars, Albigenses, and good men of Languedoc:  http://usna.edu/Users/history/abels/crusades/Pegg_2001_Journal-of-Medieval-History.pdf