| title | media type | ISBN-13 | year of publication | |
|---|---|---|---|---|
| Que Es el Amor | Paperback | 978-970-677-165-0 | ||
| Que Es La Belleza? | " | 978-970-677-166-7 | ||
| Que Es la Muerte? | " | 978-970-677-167-4 | 2006 | |
| Que es lo correcto? | " | 978-970-677-207-7 | 2007 | |
| Que Es Lo Divertido? | " | 978-970-677-168-1 | ||
| Was ist Geld? | Taschenbuch | 978-3-940650-04-7 | 2009 | |
| Was ist Gott? | " | 978-3-940650-02-3 | 2008 | |
| Was ist Liebe? | " | 978-3-940650-00-9 | 2007 | |
| Was ist Tod? | " | 978-3-940650-01-6 | 2007 | |
| What is a Family? | Paperback | 978-0-9826513-0-8 | 2016 | |
| What is a Family? | Hardcover | 978-0-9826513-1-5 | 2011 | |
| What is a Friend? | Paperback | 978-0-9762743-9-1 | 2013 | |
| What Is Beautiful? | " | 978-0-9637597-7-1 | 2015 | |
| What Is Death | " | 978-0-9637597-5-7 | 2000 | |
| What is Funny? | " | 978-0-9637597-9-5 | 2013 | |
| What Is God? | " | 978-0-920668-88-7 | 1990 | |
| What Is Love? | Hardcover | 978-0-9637597-3-3 | 2013 | |
| What Is Love? | " | 978-0-9637597-2-6 | 1996 | |
| What is Money? | Paperback | 978-0-9762743-3-9 | 2013 | |
| What Is Money? | Hardcover | 978-0-9762743-2-2 | 2006 | |
| What is Peace? | Paperback | 978-0-9762743-5-3 | 2018 | |
| What Is Peace? | Hardcover | 978-0-9762743-4-6 | 2006 | |
| What Is Right? | Paperback | 978-0-9762743-0-8 | 2005 | |
| What Is Right? | Hardcover | 978-0-9762743-1-5 | 2005 |
Abentheuer Verlag · ED NUEVO MEXICO · Firefly Books · Veronica Lane Books