- Understanding African Philosophy: A Cross-cultural Approach to Classical and Contemporary Issues
- Wagner's Parsifal: An Appreciation in the Light of His Theological Journey
- Seeds of the Spirit: Wisdom of the Twentieth Century
- Theology of Wagner's Ring Cycle I: The Genesis and Development of the Tetralogy and the Appropriation of Sources, Artists, Philosophers, and Theologians
- Theology of Wagner's Ring Cycle II