Critique of Practical Reason

Zero: The Biography of a Dangerous Idea

Critique of Pure Reason

The Story Of Aristotle's Philosophy (Unabridged)

Summary of Will Durant & Ariel Durant's The Lessons of History

Kant's Foundations of Ethics

Philosophical Investigations

The Critique of Pure Reason, Volume 2

Kant: A Very Short Introduction

The World as Will and Idea: Volume 2

Shop Class as Soulcraft: An Inquiry into the Value of Work

The Critique of Practical Reason

Philosophy of Science: A Very Short Introduction, 2nd Edition

Prolegomena to Any Future Metaphysics (Unabridged): optional

Philosophy 101: From Plato and Socrates to Ethics and Metaphysics, an Essential Primer on the History of Thought

Dreams of a Spirit-Seer

The Philosophy Book: Big Ideas Simply Explained

Groundwork of the Metaphysics of Morals

Human, All Too Human

Perpetual Peace: A Philosophical Essay: Demanding Audio Book