A Discourse on Method and Meditations on First Philosophy

Rene Descartes;  Donald Cress

4th ed.

Indianapolis: Hackett Publishing Company
ISBN: 0872204200 (Paper Text)

An Enquiry Concerning Human Understanding

David Hume;  Thomas L Beauchamp

New York: Oxford University Press
ISBN: 0198752482 (Paper Text)

The Critique of Pure Reason:
Unified Edition with All Variants from the 1781 and 1787 Editions

Immanuel Kant;  Werner S Pluhar

Indianapolis: Hackett Publishing Company
ISBN: 0872202577 (Paper Text)

Tractatus Logico-Philosophicus

Ludwig Josef Johann Wittgenstein;  David Francis Pears;  Brian McGuinnes

New York: Routledgw
ISBN: 0415254086 (paper)

From a Logical Point of View: Nine Logico-Philosophical Essays

Willard V Quine

2nd ed.,Revised
Cambridge: Harvard University Press
ISBN: 0674323513

Science, Perception and Reality

Wilfrid Sellars

Atascadero: Ridgeview Publishing Company
ISBN: 0924922001 (Paper Text)