Hirschau
- Much of this article in the New Schaff-Herzog Encyclopedia of Religious Knowledge is devoted to biographical information on Abbot William and the monastic reforms he introduced. Includes bibliography. Requires ability to view PNG files.
- http://www.ccel.org/ccel/schaff/encyc05/Page_296.html

Blessed William of Hirsau
- Brief biography.
- http://www.saintpatrickdc.org/ss/0704.htm#wilh

Bl. William
- Biographical article on this Cluniac, abbot of Hirschau, monastic reformer, astronomer, musician, who died in 1091. In the Catholic Encyclopedia.
- http://www.newadvent.org/cathen/15629b.htm