Harald Schweizer · Harold Schweizer
| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Zickzack neu 4 New German Spelling: Stage 4 | 978-0-17-440355-5 | 2001 | Paul Rogers · Bryan Goodman-stephens |
| Zickzack neu 4: Stage 4 | 978-0-17-439894-3 | 1999 | Paul Rogers · Bryan Goodman-stephens |
| Zickzack Neu: Stage 1A | 978-0-17-439573-7 | 1999 | Bryan Goodman-Stephens · Paul Rogers · Lol Briggs |
| Zickzack Neu: Stage 1B | 978-0-17-439574-4 | 1999 | Bryan Goodman-Stephens · Paul Rogers · Lol Briggs |
| Zickzack Neu: Student Book with New German Spellings Stage 1 | 978-0-17-440353-1 | 2001 | Paul Rogers · Lol Briggs · Bryan Goodman-Stephens |