Siapa ayah Baudouin I ?
Baudouin I dari Yerusalem
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Fulcher of Chartres, A History of the Expedition to Jerusalem, 1095-1127, trans. Frances Rita Ryan. University of Tennessee Press, 1969.
Anna Comnena, The Alexiad, trans. E.R.A. Sewter. Penguin Books, 1969.
William of Tyre, A History of Deeds Done Beyond the Sea, trans. E.A. Babcock and A.C. Krey. Columbia University Press, 1943.
Steven Runciman, A History of the Crusades, vols. I-II. Cambridge University Press, 1951-1952.