1. Adams, Robert. 2007. A Theory of Virtue. Oxford: Oxford University Press.
2. Anderson, Elizabeth. 1993. Value in Ethics and Economics. Cambridge, MA: Harvard University Press.
3. Audi, Robert. 2004. The Good in the Right. Princeton: Princeton University Press.
4. Blanshard, Brand. 1961. Reason and Goodness. London: Routledge Press.
5. Two Concepts of Intrinsic Value