- Die Zeit Des Ignatius: Und Die Chronologie Der Antiochenischen Bischofe Bis Tyrannus (1878)
- Das Neue Testament Um Das Jahr 200 (1889)
- Monasticism: Its Ideals And History And The Confessions Of St. Augustine
- The Expansion of Christianity in the First Three Centuries
- History of Dogma: Complete in Seven Volumes Bound as Four