| title | ISBN-13 | year of publication |
|---|---|---|
| Backpack 1 Workbook with Audio CD | 978-0-13-245125-3 | 2009 |
| Backpack 2 Workbook with Audio CD | 978-0-13-245130-7 | 2009 |
| Backpack 3 Workbook with Audio CD | 978-0-13-245104-8 | 2009 |
| Backpack 4 Workbook with Audio CD | 978-0-13-245167-3 | 2009 |
| BACKPACK STARTER 2/E WRBK/SONGS | 978-0-13-208483-3 | 2009 |
A. P. · H.A. · H. P. · Herrera, P. · HERRERA/PINKLEY