One: Being an Investigation into the Unity of Reality and of its Parts, including the Singular Object which is Nothingness

Being Logical: A Guide to Good Thinking

An Introduction to Non-Classical Logic: From If to Is, Edition 2

How to Solve It: A New Aspect of Mathematical Method

The Fifth Corner of Four: An Essay on Buddhist Metaphysics and the Catuṣkoṭi

A Rulebook for Arguments: Edition 5

Mathematical Pluralism

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

Doubt Truth to be a Liar

The Philosopher's Book of Questions & Answers: Questions to Open Your Mind

In Contradiction: Edition 2

How to Win Every Argument: The Use and Abuse of Logic, Edition 2

Towards Non-Being: Edition 2

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

A Course in Miracles - Explanations of Major Themes

A Dictionary of Logic

A Reasonable Response: Answers to Tough Questions on God, Christianity, and the Bible

Everything and Nothing

There Are Two Errors in the the Title of This Book, Revised and Expanded (Again): A Sourcebook of Philosophical Puzzles, Problems, and Paradoxes, Edition 3