- Catholic Encyclopedia - Pope St. Sixtus III, also spelled Xystus, d. 440.
www.newadvent.org/cathen/14032a.htm
- Popes Through the Ages - Account of the pontificate of St. Sixtus III, from the book by Joseph Brusher.
www.cfpeople.org/Books/Pope/POPEp44.htm
- The Ecole Glossary - Brief profile of Pope St. Sixtus III mentions that he founded the first known monastery in Rome.
cedar.evansville.edu/~ecoleweb/glossary/sixtusiii.html
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