Cita APA (7a ed.)

O'Shea, S. (2000). The perfect heresy: The revolutionary life and death of the medieval Cathars. Walker & Co.

Cita Chicago Style (17a ed.)

O'Shea, Stephen. The Perfect Heresy: The Revolutionary Life and Death of the Medieval Cathars. New York: Walker & Co, 2000.

Cita MLA (9a ed.)

O'Shea, Stephen. The Perfect Heresy: The Revolutionary Life and Death of the Medieval Cathars. Walker & Co, 2000.