| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 1-4088-8526-3 | 1408885263 |
| ISBN-13 | 978-1-4088-8526-0 | 9781408885260 |
| Agency | English language | |
| Publishers | Bloomsbury Children's Books | |
| Bloomsbury | ||
| Bloomsbury Paperbacks | ||
| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 3-551-55698-9 | 3551556989 |
| ISBN-13 | 978-3-551-55698-1 | 9783551556981 |
| Agency | German language | |
| Publisher | Carlsen | |
| well-formed | ||
| valid hyphenation | ||
| ISBN-10 | 84-9838-823-6 | 8498388236 |
| ISBN-13 | 978-84-9838-823-7 | 9788498388237 |
| Agency | Spain | |
| Publisher | Salamandra | |
| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 87-02-23993-0 | 8702239930 |
| ISBN-13 | 978-87-02-23993-5 | 9788702239935 |
| Agency | Denmark | |
| Publisher | Gyldendalske Boghandel | |
| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 86-7702-624-X | 867702624X |
| ISBN-13 | 978-86-7702-624-0 | 9788677026240 |
| Agency | former Yugoslavia | |
| Publisher | Čarobna Knjiga | |
| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 1-5266-2031-6 | 1526620316 |
| ISBN-13 | 978-1-5266-2031-6 | 9781526620316 |
| Agency | English language | |
| Publishers | Bloomsbury Children's Books | |
| Bloomsbury | ||
| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 618-01-4434-6 | 6180144346 |
| ISBN-13 | 978-618-01-4434-5 | 9786180144345 |
| Agency | Greece | |
| Publisher | Psychogios Publications | |