| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| How to Be a Superhero: Your Complete Guide to Finding a Secret Headquarters, Hiring a Sidekick, Thwarting the Forces of Evil, and Much More!! | 978-0-452-28575-0 (0-452-28575-5) | 2004 | |
| Opal: The Phenomenal Gemstone | 978-0-9790998-0-9 (0-9790998-0-3) | 2007 | Si & Ann Frazier · Janet & Paul Clifford · Jürgen Schütz · Andrew Cody · Wilson Cooper · Bob Farrar · Catherine Gaber · Jack Townsend · Max Weibel · Michael O'Donoghue · Klaus Eberhard Wild · Elizabeth T. Smith · Alex Ritchie · Günther Neumeier & others |