Catholic Online: St. John Leonardi
- Brief biography.
- http://www.catholic.org/saints/saint.php?saint_id=359

Vietnamese Eucharistic Youth Society: St. John Leonardi
- The story of his life, suited to children.
- http://www.tntt.org/vni/tlieu/saints/St1009.htm

Saint John Leonardi
- Brief profile.
- http://www.catholic.org.uk/directory/saints/stjohnleonardi.shtml

Clerks Regular of the Mother of God of Lucca
- Article from the Catholic Encyclopedia has some biographical information on the congregation's founder Giovanni Leonardi.
- http://www.newadvent.org/cathen/04052b.htm

John Leonardi
- Profile.
- http://www.catholic-forum.com/saints/saintj47.htm