| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Essential American Govern DOS C/T/B Sup | 978-0-205-28051-3 (0-205-28051-X) | 1998 |
| Essential American Govern MAC C/T/B Sup | 978-0-205-28049-0 (0-205-28049-8) | 1998 |
| Essential American Govern Win C/T/B Sup | 978-0-205-28050-6 (0-205-28050-1) | 1998 |