| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| German Struct App 4e IBM Data | 978-0-393-99388-2 (0-393-99388-4) | 1989 | |
| Teachers Manual for German, a Structural Approach | 978-0-393-95470-8 (0-393-95470-6) | 1989 | Walter F. Lohnes · F. W. Strothmann |