| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Think A1 Workbook Bulgaria Edition | 978-1-108-43891-9 (1-108-43891-1) | 2019 | Herbert Puchta · Jeff Stranks · Peter Lewis-Jones |
| Think A2 Student's Book Bulgaria Edition | 978-1-108-43880-3 (1-108-43880-6) | 2019 | Herbert Puchta · Jeff Stranks · Peter Lewis-Jones |