Ngā tūemi rite: The Oxford dictionary of popes /
- The oxford dictionary of Popes /
- Keepers of the keys : a history of the popes from St. Peter to John Paul ll /
- The Papacy and the modern world /
- Ten popes who shook the world
- Der Verlust der Eindeutigkeit : zur Krise papstlicher Autoritat im Kampf um die Cathedra Petri /
- Pope, church, and city essays in honour of Brenda M. Bolton /