| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Impact Issues 3 Student Book with Audio CD | 978-962-01-9932-5 (962-01-9932-4) | 2008 | Richard R. Day · Junko Yamanaka · Michael Rost |
| Impact Issues Level 1 Student Book w/CD | 978-962-01-9930-1 (962-01-9930-8) | 2011 | |
| Impact Issues Level 2 Student Book w/CD | 978-962-01-9931-8 (962-01-9931-6) | 2011 | Richard R. Day · Junko Yamanaka · Michael Rost |