As a cardinal , the top staff of the central administration is called the Roman Catholic Church ( Roman Curia ) that the rank of cardinal hold (especially the leaders of the various congregations , the Cardinal Prefect and the Cardinal Secretary of State ).
- Andreas Engisch: With red socks to the Pope. Welt am Sonntag, February 4, 2011, accessed July 15, 2016 .
- Church from AZ. (No longer available online.) German Bishops' Conference, archived from the original on July 15, 2016 ; accessed on July 15, 2016 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.