| 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 | 1-78939-150-4 | 1789391504 |
| ISBN-13 | 978-1-78939-150-3 | 9781789391503 |
| Agency | English language | |
| Publisher | Pottermore Publishing | |