A. S. · B. A. · B. S. · B. Schwartz · Betty Schwartz
HarperCollins · Piggy Toes Press
| title | ISBN-13 | year of publica- tion |
|---|---|---|
| What Color Should I Be? | 978-0-375-84421-8 | 2008 |
| What Makes a Rainbow | 978-1-58117-220-1 | 2003 |
| What Makes a Rainbow?: Pop-Up | 978-1-58117-076-4 | 2000 |
| What Makes Music? | 978-1-58117-139-6 | 2001 |
| Wiggly Worm: A We-Wiggle Book of Colors and Numbers | 978-0-06-113847-8 | 2008 |