A. S. · Anna Sikorzynska · Anna Sikorzynska, Bartosz Michalowski Michael Harris · Anna Sikorzynska Michael Harris
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Opportunities 1 Language Powerbook | 978-1-4058-0033-4 (1-4058-0033-X) | 2005 | David Mower · Michael Harris |
| Opportunities 1 Students' Book | 978-1-4058-0034-1 (1-4058-0034-8) | 2005 | Michael Harris · David Mower |
| Opportunities 1 Teacher's Book | 978-1-4058-0035-8 (1-4058-0035-6) | 2005 | David Mower · Michael Harris |