books by subject
Philosophical Logic

The Cambridge Companion to Wittgenstein (Cambridge Companions to Philosophy)

The Art of Philosophizing

Outlines of Pyrrhonism (Great Books in Philosophy)

Francis Bacon: The New Organon (Cambridge Texts in the History of Philosophy)

The Frege Reader (Wiley Blackwell Readers)

Frege (Past Masters Series)

Frege: An Introduction to the Founder of Modern Analytic Philosophy (Penguin philosophy)

An Inquiry into the Human Mind: On the Principles of Common Sense (Edinburgh Edition of Thomas Reid) (The Edinburgh Edition of Thomas Reid)

The Philosophy of Logical Atomism (Library of Living Philosophers)

On the Nature and Existence of God

Thinking Clearly: A Guide to Critical Reasoning

Think!: Before It's Too Late

Kant's "Critique of Pure Reason": A Commentary for Students (Key Texts S.)

Critique of Pure Reason: Unified Edition (with all variants from the 1781 and 1787 editions)

Rationalism (Key Texts S.)

Hegels Science of Logic

Hume's Reason

Philosophy: The Concept and its Manifestations

Categories and De Interpretatione (Clarendon Aristotle Series)

Critique of Pure Reason

Kant's Theory of Knowledge: An Introduction to 'the Critique of Pure Reason'

Logical Positivism

From Stimulus to Science

The Great Philosophers: Ayer

Wittgenstein (Oneworld Philosophers S.)

Ludwig Wittgenstein: Philosophy and Language (Wittgenstein Studies)

An Introduction to Wittgenstein's "Tractatus" (Wittgenstein Studies)

Analogy and Philosophical Language

Wittgenstein Reader: 1 (Wiley Blackwell Readers)
