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Thomas F. X. Noble, images, iconoclasm, and the carolingians, (The Middle Ages series), University of Pennsylvania Press, Philadelphia, 2009; 488 p., ISBN 978-0-8122-4141-9

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Ronald E. Heine, Origen. Scholarship in the service of the church, Oxford University Press, Oxford, 2010, pp. 275. ISBN 978-0-19-920907-1.

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