Logic

That's Maths

Introducing Infinity

Maths in Bite-sized Chunks

The Mathematical Works of Lewis Carroll

Mathematical Thinking – For People Who Hate Math

Simply Gödel

Introduction to Mathematical Philosophy

Simply Turing

Equations from God

Development Theory

The Game of Logic

Mastering Logical Reasoning

Foundations of Mathematical Thought: The Language of Numbers

The Canterbury Puzzles, and Other Curious Problems