- The Apocryphal Gospels: A Very Short Introduction (Very Short Introductions)
- Beckett and Zen: A Study of Dilemma in the Novels of Samuel Beckett (Wisdom East-West Book. Grey Series)
- Early Christian Thinkers: The Lives and Legacies of Twelve Key Figures
- The Non-Canonical Gospels
- Elizabeth I (Playscripts)