1. Kinds of Reasons
2. Burnet, Gilbert, and Francis Hutcheson [1735] (1971) Letters Between the Late Mr. Gilbert Burnet and Mr. Francis Hutchinson, Concerning The true Foundation of Virtue or Moral Goodness, in ed. Bernard Peach, Illustrations on the Moral Sense, Cambridge, MA: Harvard University, pp. 197–247.
3. Clarke, Samuel [1706] (1897) A Discourse concerning the Unchangeable Obligations of Natural Religion, in ed. L.A. Selby-Bigge, The British Moralists, Oxford: Clarendon Press, vol. 2, pp. 3–56.