There are 1 book by O'CALLAGHAN on BookOrb. A strong starting point is God and Mediation (2017). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has O'CALLAGHAN written?
BookOrb lists 1 book by O'CALLAGHAN.
Where should I start with O'CALLAGHAN?
A good starting point is God and Mediation (2017).
What is the O'CALLAGHAN books in order list?
In publication order: 1. God and Mediation (2017).