| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Collectopia: A Friendship Scraptacular | 978-0-375-84111-8 (0-375-84111-3) | 2007 | Peggy Brown |
| Collectopia: The All-Year Yearbook | 978-0-375-84113-2 (0-375-84113-X) | 2008 | Peggy Brown · Lisa Perrett |
| Collectopia: Wacktivity | 978-0-375-84110-1 (0-375-84110-5) | 2007 | Peggy Brown |