| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| OPEN DOORS 1A Book + Workbook 6ºEGB | 978-0-19-436314-3 (0-19-436314-7) | 2010 |
| OPEN DOORS 1B Book + Workbook 7ºEGB | 978-0-19-436315-0 (0-19-436315-5) | 2010 |
| OPEN DOORS 2A Book + Workbook 8ºEGB | 978-0-19-436316-7 (0-19-436316-3) | 2010 |