- An article from the Catholic Encyclopedia ...www.newadvent.org/cathen/15611b.htm
- An article from the Catholic Encyclopedia ...www.newadvent.org/cathen/14628a.htm
- An article from the Catholic Encyclopedia ...www.newadvent.org/cathen/05286a.htm
- An article from the Catholic Encyclopedia ...www.newadvent.org/cathen/05321a.htm