Encyclopædia Britannica: Pelagia, St - Article discusses the two Antiochene saints of this name, and briefly mentions St Pelagia of Tarsus. From the 11th edition (1911). Some scanner errors. - http://encyclopedia.jrank.org/PAS_PER/PELAGIA_ST.html
For All the Saints: Pelagia of Antioch - Unfortunately confuses the two saints from Antioch named Pelagia. - http://www.saintpatrickdc.org/ss/0609.htm#mari
Catholic Encyclopedia: Pelagia - Discusses four saints named Pelagia: two from Antioch (one of whom is St. Pelagia the Harlot), St. Pelagia of Tarsus, and a St. Pelagia martyred in Nicopolis who was a companion of St. Januarius. - http://www.newadvent.org/cathen/11601d.htm