| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Humanism Answers: Speaking to the Challenge of Orthodoxy - Essays from the Humanist Institute | 978-0-01-058596-4 (0-01-058596-6) | 1995 | Somverville Kotkin · Orna Hankins |
| Toward Common Ground - The Story of the Ethical Societies in the United States | 978-0-692-28007-2 (0-692-28007-3) | 2015 | |