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Catholic Encyclopedia: William of Champeaux
http://www.newadvent.org/cathen/15632a.htm
A concise summary of his life and thought, by William Turner.
Columbia Encyclopedia: William of Champeaux
http://www.bartleby.com/65/wm/WmChmpx.html
Concise paragraph from the 2001 edition.
Evans' Experientialism: William of Champeaux
http://evans-experientialism.freewebspace.com/expery004.htm
A contemporary thinker compares this scholar's ideas to his own.
William of Champeaux
http://faculty.smu.edu/bwheeler/Ency/WilliamofChampeaux.htm
Short article noting his relation to Abelard and Heloise.