John Oecolampadius - Biographical article of this theological leader. - http://www.1911encyclopedia.org/John_Oecolampadius
The Reformation in Basel - Chapter of Schaff's book on Oecolampadius and the reformation in Basel. - http://www.ccel.org/ccel/schaff/hcc8.iv.iv.iii.html
Oecolampadius - A Catholic Encyclopedia biography of this early reformer of Basel. - http://www.newadvent.org/cathen/11213a.htm