Author: Descartes, Rene Title: Meditations on First Philosophy Publisher: Cambridge UP Edition: 1996 ISBN: 0521558182

Author: Berkeley, George Title: A Treatise Concerning the Principles of Human Knowledge Publisher: Oxford UP Edition: 1998 ISBN: 0198751613

Author: Hume, David Title: An Enquiry Concerning Human Understanding Publisher: Oxford UP Edition: 1999 ISBN: 0198752482

Author: Kant, Immanuel Title: Critique of Pure Reason (abridged) Publisher: Hackett Edition: 1999 ISBN: 0872204480