Paulus

History of Christian Dogma

Paul, the Apostle of Christ

Paul the Apostle of Jesus Christ

Christian Gnosis

Christianity and the Christian Church of the First Three Centuries

The Church History of the First Three Centuries; Volume 2

Paul, the Apostle of Jesus Christ, His Life and Work, His Epistles and His Doctrine. a Contribution to the Critical History of Primitive Christianity

Die Epochen der Kirchlichen Geschichtschreibung

Vorlesungen über Die Christliche Dogmengeschichte

Church and Theology in the Modern Era