- Catholic Dictionary: Canons Secular
- New Advent: Canon
- Episcopal Dictionary of the Church: Canon
- British History Online: Secular Canons: Cathedral of St. Paul
- The Archeological Journal: Notes on Colleges of Secular Canons in England
- JSTOR: "Rules for Monks & Secular Canons...” in The English Historical Review
- Wikipedia: “Secular Canons” in Canon (Priest)