1. David Hume, A Treatise of Human Nature, ed. L. A. Selby-Bigge, rev. ed. P. H. Nidditch, 2d ed. (Oxford: Clarendon, 1978), 211–12.
2. David Hume, An Enquiry Concerning Human Understanding, ed. L. A. Selby-Bigge, rev. ed. P. H. Nidditch, 3d ed. (Oxford: Clarendon, 1975), 27–42.
3. Immanuel Kant, Critique of Pure Reason, trans. and ed. Paul Guyer and Allen W. Wood (Cambridge: Cambridge University Press, 1998), B129–68. As is standard in Kant scholarship, references to Kant’s writings cite the page numbers of the Royal Prussian Academy edition (Kants gesammelte Schriften), which are included in the margins of the translations.
4. René Descartes, Meditations on First Philosophy, in The Philosophical Writings of Descartes, trans. John Cottingham, Robert Stoothoff, and Dugald Murdoch, vol. 2 (Cambridge: Cambridge University Press, 1984), 43.
5. Immanuel Kant, Critique of Practical Reason, in Practical Philosophy, trans. and ed. Mary J. Gregor (Cambridge: Cambridge University Press, 1996), 30–32.