| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| True 20 Adventure | 978-1-934547-14-4 (1-934547-14-X) | 2013 | Erica Balsley · Matthew E. Kaiser |
| True 20 Companion: A Sourcebook For True 20 Adventure RPG | 978-1-932442-83-0 (1-932442-83-9) | 2013 | Michelle Lyons · Steve Kenson · Erica Balsley · Matthew Kaiser · Sean Preston |