The Ecole Glossary
- Short article on the pontificate of Pope St. Felix IV, by Karen Rae Keck.
- http://www2.evansville.edu/ecoleweb/glossary/felixiv.html

St. Felix III
- Account of his pontificate.
- http://www.cfpeople.org/Books/Pope/POPEp54.htm

Pope St. Felix IV
- Since Felix II was an antipope imposed by the Arians while Pope Liberius was still alive, Pope St. Felix IV is sometimes called Felix III. Pope St. Felix IV died in 530. Article in the Catholic Encyclopedia.
- http://www.newadvent.org/cathen/06031a.htm