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Catholic Encyclopedia
http://www.newadvent.org/cathen/03144c.htm
Article on Pope St. Soter, c. 167-175. Also includes information on Pope St. Caius.
For All the Saints
http://www.saintpatrickdc.org/ss/0422.htm#sote
Brief biographical sketch of Pope St. Soter.
Popes Through the Ages
http://www.cfpeople.org/Books/Pope/POPEp12.htm
Profile of St. Soter, from the book by Joseph Brusher.
The Ecole Glossary
http://www2.evansville.edu/ecoleweb/glossary/soter.html
Very brief article on Pope St. Soter, by Karen Rae Keck.