| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Interactive Journey Through Physics, CD-Rom | 978-0-13-010804-3 (0-13-010804-9) | 1998 |
| The Local Macroeconomics Explorer | 978-0-13-020110-2 (0-13-020110-3) | 1998 |
| The Logal Microeconomics Explorer | 978-0-13-020121-8 (0-13-020121-9) | 1998 |