| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| One World: Level 2: Workbook | 978-0-13-635624-0 (0-13-635624-9) | 1991 |
| One World: Level 4: Student's Book | 978-0-13-635616-5 (0-13-635616-8) | 1994 |
| One World: Level 4: Teacher's Book | 978-0-13-635681-3 (0-13-635681-8) | 1995 |