Wikipedia: Theodore the Studite
- Life and accomplishments. Includes eleventh century mosaic of the saint.
- http://en.wikipedia.org/wiki/Theodore_the_Studite

Theodore the Studite, Abbot
- Biographical essay.
- http://www.saintpatrickdc.org/ss/1111.htm#theo

Theodore of Studium, Saint
- Brief biographical entry in the Columbia Encyclopedia.
- http://www.bartleby.com/65/th/TheodrStd.html

St. Theodore of Studium
- Biography of this monk, priest, and abbot. He was a champion of the independence of the Church, and of the veneration of icons. St. Theodore died in 826. From the Catholic Encyclopedia.
- http://www.newadvent.org/cathen/14574a.htm