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Catholic Encyclopedia: St. Willibrord
http://www.newadvent.org/cathen/15645a.htm
Article on the Benedictine missionary and bishop, who died in 739.
Catholic Online: St. Willibrord
http://www.catholic.org/saints/saint.php?saint_id=2146
Short biography.
The Life of Willibrord
http://www.fordham.edu/halsall/basis/Alcuin-willbrord.html
Modern English translation of Alcuin's hagiography from the Internet Medieval Sourcebook.
Willibrord
http://www.catholic-forum.com/saints/saintw05.htm
Illustrated profile, with links.
Willibrord of Utrecht
http://www2.evansville.edu/ecoleweb/glossary/willibrord.html
Biography, by Karen Rae Keck.
Willibrord of Utrecht, archbishop and missionary
http://elvis.rowan.edu/~kilroy/JEK/11/07.html
Anglican perspective. Brief biography, and prayers.