| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| "...That Is the Question", Answers From the Humanities | 978-0-536-21009-8 (0-536-21009-8) | 2007 | Paul Allen |
| "That Is the Question": Answers From the Humanities | 978-0-536-91281-7 (0-536-91281-5) | 2005 | Paul Allen · Helen Cox · Ron Christiansen |