| title | ISBN-13 | year of publication |
|---|---|---|
| or science books that use spoken language: German-speaking | 978-7-119-06644-8 | 1991 |
| or the use of spoken language learning series: to speak French | 978-7-119-06645-5 | 1991 |
| Speak Cantonese | 978-7-119-06649-3 | 2010 |
| Speaking English - bicolor edition | 978-7-119-06651-6 | 2010 |
| Speaking Italian - bicolor edition | 978-7-119-06650-9 | 2010 |
| Speaking Japanese - bicolor edition | 978-7-119-06652-3 | 2010 |
| Speaking Korean - bicolor edition | 978-7-119-06653-0 | 2010 |
| Speaking Spanish - bicolor edition | 978-7-119-06647-9 | 2010 |