| title | media type | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|---|
| Berlin | Library Binding | 978-0-02-707800-8 (0-02-707800-0) | 1992 | |
| Parallel Journeys | " | 978-1-4395-2810-5 (1-4395-2810-1) | 2008 | Helen Waterford · Alfons Heck |
| Parallel Journeys | Paperback | 978-0-689-83236-9 (0-689-83236-2) | 2000 | Helen Waterford · Alfons Heck |