| title | ISBN-13 | year of publication |
|---|---|---|
| Deity and Morality: With Regard to the Naturalistic Fallacy | 978-0-415-82218-3 | 2013 |
| Philosophy Through Fiction and Film | 978-0-13-097506-5 | 2003 |
| Reasons for Living: A Basic Ethics | 978-0-02-396050-5 | 1988 |
| The Good Life: Alternatives in Ethics | 978-0-02-396120-5 | 1980 |
| The Great Perhaps: God as a Question | 978-1-4422-4721-5 | 2015 |
| The Voice of Reason: Fundamentals of Critical Thinking | 978-0-19-514122-1 | 2001 |
| The Voice of Reason: Fundamentals of Critical Thinking, International Edition | 978-0-19-539986-8 | 2009 |
| What the Tortoise Taught Us: The Story of Philosophy | 978-1-4422-0552-9 | 2015 |
Macmillan · Oxford University Press · Prentice Hall · Routledge · Rowman & Littlefield Publishers