| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Boomerang Elementary Podrecznik z plyta CD Jezyk angielski | 978-83-7446-167-2 (83-7446-167-5) | 2007 | Guy Russell Torr |
| Boomerang Elementary Zeszyt cwiczen Jezyk angielski | 978-83-7195-507-5 (83-7195-507-3) | 2007 | " |