1. Brink, D. O. (1997). Kantian rationalism: Inescapability, authority, and supremacy. In G. Cullity & B. Gaut (Eds.), Ethics and practical reason. Oxford: Oxford University Press.
2. Craig, W. L., & Sinnott-Armstrong, W. (2003). God?: A debate between a Christian and an atheist. Oxford: Oxford University Press.
3. Double, R. (1996). Metaphilosophy and free will. Oxford: Oxford University Press.
4. Heuer, U. (2004). Reasons for action and desires. Philosophical Studies, 121(1), 43–63.
5. Huemer, M. (2005). Ethical intuitionism. Basingstoke, UK: Palgrave Macmillan.