For All the Saints: William of Norwich
- Essay on William, venerated locally as a boy "martyr" for a little under 200 years. The accusation against the Jews on which his alleged martyrdom, and therefore sanctity, rests was denounced vigorously by two 13th-century popes.
- http://www.saintpatrickdc.org/ss/0324.htm#will

Patron Saints Index: William of Norwich
- Profile of the boy.
- http://www.catholic-forum.com/saints/saintw12.htm

St. William of Norwich
- William's corpse was found showing signs of a violent death. He is the earliest example of a medieval blood libel saint, having died in 1144. His biographer relied on hearsay, and was "a man of unlimited credulity."
- http://www.newadvent.org/cathen/15635a.htm