| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| The Ultimate IQ Book | 978-0-7063-7148-2 (0-7063-7148-8) | 1993 | Philip J. Carter · Marcel Feenstra |
| Ultimate IQ Challenge | 978-0-7063-7232-8 (0-7063-7232-8) | 1994 | Marcel Feenstra · Philip J. Carter |