Pontian - Short entry on Pope St. Pontian, by Karen Rae Keck. Marred by a couple typos. - http://www2.evansville.edu/ecoleweb/glossary/pontian.html
Pope St. Pontian - He was exiled to the Sardinian mines in 235 and died there of privation. Article in the Catholic Encyclopedia. - http://www.newadvent.org/cathen/12229b.htm
St. Pontian - Account of his exile and martyrdom. - http://www.cfpeople.org/Books/Pope/POPEp18.htm