1. Diamond, Cora. 1996. Wittgenstein, Mathematics, and Ethics: Resisting the Attraction of Realism. In The Cambridge Companion to Wittgenstein, ed. Hans Sluga and David Stern. Cambridge: Cambridge University Press.
2. Harcourt, Edward, 2019. ‘Moral Concepts, “Natural Facts” and Naturalism: Outline of a Wittgensteinian Moral Philosophy, Benjamin De Mesel and Oskari Kuusela eds., Ethics in the Wake of Wittgenstein. New York: Routledge.
3. Kuusela, Oskari. 2018. Wittgenstein, Ethics and Philosophical Clarification. In Wittgenstein’s Moral Thought, ed. Reshef Agam-Segal and Edmund Dain. New York: Routledge.
4. ———. 2019. Wittgenstein on Logic as the Method of Philosophy: Re-examining the Roots and Development of Analytic Philosophy. Oxford: Oxford University Press.
5. ———. 2020. ‘Wittgenstein and the Unity of Good’. European Journal of Philosophy 28 (2): 428–444.