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the Battle for Christendom. Oxford: Oxford University Press. ISBN 978-019988371-4. Peters, Edward, ed. (1980). "The Cathars". Heresy and Authority in...

Battle for Christendom. Oxford, UK: Oxford University Press. ISBN 978-019988371-4. Perdue, Peter C. (2005). China Marches West: The Qing Conquest of...