Campion, Edmund - Biographical portrait of the brilliant English Jesuit. In the 1911 Encyclopædia Britannica. Some scanner errors. - http://www.1911encyclopedia.org/Edmund_Campion
Edmund Campion, Alexander Briant, & Ralph Sherwin - All three martyred at Tyburn on 1 December, 1581. They were canonized in 1970 as part of the Forty Martyrs of England and Wales. - http://www.saintpatrickdc.org/ss/1201.htm#ralp
Campion, Saint Edmund - Short biography, in the Columbia Encyclopedia. - http://www.bartleby.com/65/ca/CampionSt.html