History of Catholicism in Germany
- A collection of open source Wikipedia articles on the history of the Catholic Church in Germany.
- http://en.wikipedia.org/wiki/Category:History_of_Catholicism_in_Germany

Faith and Fatherland
- The life of Count Clement August von Galen, Bishop of Munster who spoke out against the policies of the Nazis.
- http://www.catholicculture.org/docs/doc_view.cfm?recnum=353

Catholic Association of Germany
- An examination of the response of German Catholics to the events of 1848. From the 1848 Encyclopedia.
- http://www.ohiou.edu/~Chastain/ac/cathger.htm