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Hughes, Philip.Chapter V: 'Facilis Descensus ...' 1471–1517: A Papacy of Princes // History of the Church: Volume 3: The Revolt Against the Church: Aquinas to Luther (англ.). — revised. — London: Sheed & Ward[англ.], 1979. — P. 415. — ISBN 978-0-7220-7983-6.
