| title | ISBN-13 | year of publication |
|---|---|---|
| Spectrum 1a TB | 978-0-13-020520-9 | 1993 |
| Spectrum 1b TB | 978-0-13-020538-4 | 1993 |
| Spectrum 2a TB | 978-0-13-832825-2 | 1993 |
| Spectrum 2b TB | 978-0-13-832817-7 | 1993 |
| Spectrum 3a TB | 978-0-13-832833-7 | 1994 |
| Spectrum 3b TB | 978-0-13-832841-2 | 1994 |
| Spectrum 4a TB | 978-0-13-832858-0 | 1994 |
| Spectrum 4b TB | 978-0-13-832866-5 | 1993 |