APA (7th ed.) Citation

Birks, W., & Gilbert, R. A. (1987). The treasure of Montsegur: A study of the Cathar heresy and the nature of the Cathar secret. Crucible.

Chicago Style (17th ed.) Citation

Birks, Walter, and R. A. Gilbert. The Treasure of Montsegur: A Study of the Cathar Heresy and the Nature of the Cathar Secret. Wellingborough: Crucible, 1987.

MLA (9th ed.) Citation

Birks, Walter, and R. A. Gilbert. The Treasure of Montsegur: A Study of the Cathar Heresy and the Nature of the Cathar Secret. Crucible, 1987.