| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Extreme Monsters: Saving Steiner | 978-1-57791-180-7 (1-57791-180-6) | 2009 | Eric Smith |
| Extreme Monsters: What's With Wulf? | 978-1-57791-179-1 (1-57791-179-2) | 2005 | Mel Freidman · Ellen Weiss |
| Guess Who I Am...: a fold-out animal surprise book | 978-1-57791-175-3 (1-57791-175-X) | 2005 | |