| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Speed-Up Your English Vocabulary at work | 978-83-60229-79-8 (83-60229-79-1) | 2015 |
| Speed-Up Your English. Vocabulary at Work - Plus | 978-83-60229-80-4 (83-60229-80-5) | 2015 |
J.K · J. Krzton · Justyna Krzton · M J · M. K. · R.J. · R.K. · R. M. · Ron Mukerji