Humanist Press · Prentice Hall
| title | media type | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|---|
| Ancient Myth and Modern Man | Paperback | 978-0-13-035485-3 (0-13-035485-6) | 1975 |
| Ancient Myth and Modern Man | Hardcover | 978-0-13-035493-8 (0-13-035493-7) | 1975 |
| Freethought Across the Centuries: Toward a New Age of Enlightenment | " | 978-0-931779-04-6 (0-931779-04-9) | 1996 |