Socratic Logic: A Logic Text using Socratic Method, Platonic Questions, and Aristotelian Principles, Edition 3.1

The Critical Thinking Toolkit

Darwin (The Routledge Philosophers)

What is this thing called The Meaning of Life?

Logic: A Very Short Introduction (Very Short Introductions)

Set Theory: An Open Introduction (Open Logic Project Textbooks)

Neural-Symbolic Cognitive Reasoning (Cognitive Technologies)

Beginning Logic

A Workbook for Arguments: A Complete Course in Critical Thinking

Reasons for Logic, Logic for Reasons: Pragmatics, Semantics, and Conceptual Roles