| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 2002 | 978-0-9721537-0-6 | V. M. Rabolu | Hercolubus or Red Planet |
| '' | 978-0-9721537-1-3 | V. M. Rabolu | Hercolubus o planeta rojo (Spanish Edition) |
| 2004 | 978-0-9721537-2-0 | V.M. Rabolu | Hercolubus O Planeta Rojo (Spanish Edition) |