↑Magill, Frank N. (2012). The Middle Ages: Dictionary of World Biography, Volume 2. Hoboken: Taylor and Francis. p.606. ISBN978-1-57958-041-4.
↑Cross, F. L.; Livingstone, Elizabeth A., eds. (2005). The Oxford dictionary of the Christian Church (3rd ed. reved.). Oxford; New York: Oxford University Press. p.1004. ISBN978-0-19-280290-3.
↑Lock, Peter (2013). The Routledge Companion to the Crusades. Routledge Companions to History. Hoboken: Taylor and Francis. p.183. ISBN978-1-135-13137-1.
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