- _In Solitary Witness:The Life and Death of Franz Jagerstatter_ (1964)
- _Krig, samvittighet og dissens_ (1967)
- _Tyske katolikker og Hitlers kriger_ (1969)
- _Another Part of the War:The American Protestant Churches and the Second World War_ (1974)
- _Return to the Source:An Exploration of the History and Theology of Baptism_ (1975)
- _Et spørsmål om tillit:Kirken i en postmoderne verden_ (1991)
- _Living the Church:A Vision for the People of God_ (1996)