If you are interested in the Cathars, their history and their beliefs, there is no shortage of material. The problem is sorting the wheat from the chaff. Here is some of the wheat.
BOOKS
The Albigensian Crusade by Jonathan Sumption ;
Paperback: 272 pages ; Dimensions (in inches): 0.84 x 8.49
x 5.32 Publisher: Faber & Faber; (June 2000);
ISBN: 0571200028 ; Hardcover;
Publisher: Faber & Faber; (April 1978;
ASIN: 0571110649 
Massacre at Montsegur: A History of the Albigensian
Crusade by Zoe Oldenbourg ; Paperback:
432 pages ; Dimensions (in inches): 1.33 x 8.46 x 5.44;
Publisher: Phoenix Press, London WC2; (June 2001);
ISBN: 1842124285; (
Buché à Montsegùr)
The Other God: Dualist Religions from Antiquity
to the CatharHeresy (Yale Nota Bene);
by Yuri Stoyanov; Paperback: 476
pages ; Dimensions (in inches): 1.30 x 7.70 x 5.01 Publisher:
Yale Univ Pr; (August 2000); ISBN:
0300082533. The definitive work on Dualism.
Montaillou, village occitan de 1294 à 1324, Editions
Gallimard (Paris, 1978), 
Montaillou,
abridged English version, Penguin (London, 1978), Book by
Emmanuel Le Roy Ladurie. A good account of a
coda to the main story of the Cathars, based on Inquisition
records of the arrest of a whole village called Montaillou
on suspicion of Catharism.
The following links will take you to pages containg more
recommended books dealing with Catharism
,
the Occitan
and Occitania ,
Cathar
Crusades ,
and the Papal
Inquisition
in the Languedoc.
Cathar Documents on the Internet
Cathar
Right of General Confession - The Apparelhamentum, English
translation of the Lyons Ritual 
A
Gnostic gospel: The Book of John the Evangelist
Orthodox and Catholic Documents on the Web
Anna
Comnena, on the Bogomils
c. 1110 in English translation from the Greek. The Bogomils
were almost certainly the source of Catharism in the West
Canon
Three of the Fourth Lateran Council (1215)
Accusations
against the Albigensians by Raynaldus (13th C)
Bernard
Gui,
Extract from the Inquisitors' Manual [1307-1323], Practica
inquisitionis heretice pravitatis on the Waldensians
Bernard
Gui,
Extract from the Inquisitors' Manual [1307-1323], Practica
inquisitionis heretice pravitatis on the Beguines
Bernard
Gui,
Extract from the Inquisitors' Manual [1307-1323], Practica
inquisitionis heretice pravitatis on the Albigensians
(Cathars)
Angelo
Clareno, a Spiritual Franciscan: On Torture ,
early 14th Cent.
Canso de la crozada - Guillaume de Tudèle
The
Siege of Toulouse 1217-18 according to The Chronicle
of William of Puylaurens, Chapters 26-8
Medieval Sourcebook:Primary Documents Jacques Fournier, Bishop of Pamiers 1318-1325: The Inquisition Record. [At SJSU] English translation by Nancy P. Stork of selected confessions by Cathar heretics and Jews to Bishop Jacques Fournier and the Inquisition at Pamiers.
David Burr: Introduction to Inquistion Documents.
Primary Document Petrus Iohannes Olivi: Selections from the Apocalypse Commentary (1247/8-1298).
Extracts from various documents concerning the War against the Cathars: Minerve, (the tile of the site does not accurately describe its contents) Sources cited
OTHER
Arques, Museum: located in the house of René Neli, the man who revived interest in the Cathars early in twentieth century.
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to: the Papal Inquisition
