Books
What is Christianity? Lectures Delivered in the University of Berlin during the Winter-Term 1899-1900, 2nd Revised Edition
2012
History of Dogma, 3rd Edition, Complete Vol. 1-6
2012
The Mission and Expansion of Christianity In the First Three Centuries, 2nd Edition
2012
Essays on the Social Gospel
2012
The Apostles' Creed, Revised Edition
2012