| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 87-02-27249-0 | 8702272490 |
| ISBN-13 | 978-87-02-27249-9 | 9788702272499 |
| Agency | Denmark | |
| Publisher | Gyldendalske Boghandel | |
| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 1-338-29919-0 | 1338299190 |
| ISBN-13 | 978-1-338-29919-9 | 9781338299199 |
| Agency | English language | |
| Publishers | Arthur A. Levine Books | |
| Scholastic | ||