1. William James (1960) The Varieties of Religious Experience: A Study in Human Nature (London: Collins), lec. 6 & 7.
2. Sir David Ross (1930) The Right and the Good (Oxford: Clarendon Press), Chapter 2.
3. Charles Taylor (2007) A Secular Age (Cambridge, MA: Belknap Press), pp. 191–92.
4. Derek Parfit (1984) Reasons and Persons (Oxford: Oxford University Press), Appendix I.
5. Immanuel Kant (1993) Groundwork of the Metaphysics of Morals, 3rd edn [1785] (trans. James W. Ellington) (Indianapolis: Hackett). pref.