1. Broad, C.D. 1930. Five Types of Ethical Theory, 53–83. London: Kegan Paul, Trench, Trubner & Co.
2. Butler, J. 1726; 2nd: 1729 = 2017. Fifteen Sermons and Other Writings on Ethics, David McNaughton ed., Oxford: Oxford University Press. (= FS)
3. Butler, J. 1729 = 2017. Preface to 1729 edition of Fifteen Sermons, David McNaughton ed., Oxford: Oxford University Press. (= PS)
4. Cunliffe, C. 1992. Joseph Butler’s Moral and Religious Thought: Tercentenary Essays. Oxford: Clarendon Press.
5. Dent, N.J.H. 2005. Rousseau. London and New York: Routledge.