Martin, S. (2014). The Cathars: The rise and fall of the great heresy. Pocket Essentials.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMartin, Sean. The Cathars: The Rise and Fall of the Great Heresy. Herts, Alabama: Pocket Essentials, 2014.
एमएलए (9वां संस्करण) प्रशस्ति पत्रMartin, Sean. The Cathars: The Rise and Fall of the Great Heresy. Pocket Essentials, 2014.
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