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Catholic Encyclopedia
http://www.newadvent.org/cathen/06029b.htm
Pope St. Felix I, d. 274.
For All the Saints
http://www.saintpatrickdc.org/ss/0530.htm#feli
Very brief biography of Pope St. Felix I.
Popes Through the Ages
http://www.cfpeople.org/Books/Pope/POPEp26.htm
Account of the pontificate of St. Felix I.
The Ecole Glossary
http://www2.evansville.edu/ecoleweb/glossary/felixi.html
Very brief entry on the pontificate of Pope St. Felix I, by Karen Rae Keck.