| title | media type | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|---|
| The Heritage of Terra: The Obligation: Shadows of a Threat | Paperback | 978-0-9825504-0-3 (0-9825504-0-5) | 2009 |
| The Heritage of Terra: The Obligation: Shadows of a Threat | Hardcover | 978-0-9825504-1-0 (0-9825504-1-3) | 2009 |