René Descartes, Discourse on Method and Meditations on First Philosophy, Donald Cress, tr. (Indianapolis: Hackett Publishing Company, 1998).

David Hume, An Enquiry Concerning Human Understanding (Indianapolis: Hackett Publishing Company, 1993).

Immanuel Kant, Prolegomena to Any Future Metaphysics, James Ellington, tr. (Indianapolis: Hackett Publishing Company, 2002).

Gottfried Wilhelm Leibniz, Discourse on Metaphysics and Other Essays, Daniel Garber and Roger Ariew, tr. (Indianapolis: Hackett Publishing Company, 1991).

John Locke, An Essay Concerning Human Understanding, Kenneth Winkler, ed. (Indianapolis: Hackett Publishing Company, 1996).

George Berkeley, A Treatise Concerning the Principles of Human Knowledge, pref., intro., and §§1-33, 135-145 (on a handout: (i) for printing, (ii) for viewing on screen, (iii) for printing as a booklet, to do which you must print 2-sided, flipping on the long side)