Höwing, Thomas, (Ed.) (2016). "The Highest Good and the Notion of the Good as Object of Pure Practical Reason". The Highest Good in Kant’s Philosophy. De Gruyter. doi:10.1515/9783110369007-005. ISBN978-3-11-036900-7.
Höwing, Thomas, (Ed.) (2016). "God, the Highest Good, and the Rationality of Faith: Reflections on Kant's Moral Proof of the Existence of God". The Highest Good in Kant’s Philosophy. De Gruyter. doi:10.1515/9783110369007-010. ISBN978-3-11-036900-7.