What the Tortoise Said to Achilles

How to Solve It: A New Aspect of Mathematical Method

Condensation of Determinants: Condensation of Determinants: Lewis Carroll's Mathematical Magic

Logically Fallacious: The Ultimate Collection of Over 300 Logical Fallacies (Academic Edition)

Euclid and His Modern Rivals

Math Storm Olympiad Problems

Lewis Carroll’s Guide for Insomniacs

Short-Cut Math

Selected Mathematical Works: Symbolic Logic + The Game of Logic + Feeding the Mind

An Illustrated Book of Bad Arguments: Learn the Lost Art of Making Sense

My Best Mathematical and Logic Puzzles

Alex's Adventures in Numberland: Dispatches from the Wonderful World of Mathematics

Fast Math: Learn the Secrets of Mental Math: By Using Vedic Math and Other Math Tricks to Perform Mental Calculations from Multiplication to Percentages without Calculators

536 Puzzles and Curious Problems

Concepts of Modern Mathematics

Foundations and Fundamental Concepts of Mathematics

Logic: A Very Short Introduction: Edition 2

That's Maths: The Mathematical Magic in Everyday Life