Oxford University Press · Walking Tree Publishers
| title | ISBN-13 (ISBN-10) | year of publication | |
|---|---|---|---|
| Four Christian Fantasists. A Study of the Fantastic Writings of George MacDonald, Charles Williams, C.S. Lewis & J.R.R. Tolkien | 978-3-905703-04-7 (3-905703-04-1) | 2007 | |
| The Word and the Christ: An Essay in Analytic Christology | 978-0-19-826198-8 (0-19-826198-5) | 1991 |