The Foundations of Arithmetic: A Logico-Mathematical Enquiry into the Concept of Number
Tractatus Logico-Philosophicus
The Principles of Mathematics
Tractatus Logico-Philosophicus (Routledge Classics) (Volume 123)
Naming and Necessity
Philosophical Investigations
Gödel's Proof
Introduction to Mathematical Philosophy
Critique of Pure Reason (The Cambridge Edition of the Works of Immanuel Kant)