_Introduction to Objectivist Epistemology_, Ayn Rand The "Organon" books by Aristotle _Introduction to Logic_, H. W. B. Joseph _An Invitation to Formal Reaso

_Introduction to Objectivist Epistemology_, Ayn Rand The "Organon" books by Aristotle _Introduction to Logic_, H. W. B. Joseph _An Invitation to Formal Reasoning_, Fred Sommers & George Englebretsen