Catholic Online: St. Zosimus
- Brief biography says that the pope was so disliked in Rome that his death was the occasion of celebration in the streets.
- http://www.catholic.org/saints/saint.php?saint_id=2093

Zozimus (Zosimus), Pope
- Says that he formally condemned Pelagianism after initially being misled by its proponents.
- http://www.saintpatrickdc.org/ss/1226.htm#zozi

The Ecole Glossary: Zosimus
- Brief biographical profile, by Karen Rae Keck.
- http://www2.evansville.edu/ecoleweb/glossary/zosimus.html

Pope St. Zosimus
- Account of his pontificate focuses on his entanglement with the Pelagian controversy.
- http://www.newadvent.org/cathen/15764c.htm

Popes Through the Ages: St. Zosimus
- Overview of his pontificate. From the book by Joseph Brusher.
- http://www.cfpeople.org/Books/Pope/POPEp41.htm

Patron Saints Index: Zosimus
- Profile mentions a few surviving documents from his pontificate.
- http://www.catholic-forum.com/saints/saintz03.htm