- Gnosis: An Introduction
- Christian Theology and Its Institutions in the Early Roman Empire: Prolegomena to a History of Early Christian Theology
- The Monk's Haggadah: A Fifteenth-Century Illuminated Codex from the Monastery of Tegernsee, with a Prologue by Friar Erhard Von Pappenheim
- Tauffragen Und Bekenntnis
- Origenes und sein Erbe (Texte Und Untersuchungen Zur Geschichte Der Altchristlichen Literatur)