| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 88-8451-049-X | 888451049X |
| ISBN-13 | 978-88-8451-049-5 | 9788884510495 |
| Agency | Italy | |
| Publisher | Salani Editore | |
| not well-formed | |||||||||
| no hyphens provided | |||||||||
| The UCC prefix is malformed (should be 978 or 979). | |||||||||
| The check-digit is correct. | |||||||||
| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 88-6256-151-2 | 8862561512 |
| ISBN-13 | 978-88-6256-151-8 | 9788862561518 |
| Agency | Italy | |
| Publisher | Salani Editore | |
| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 88-6256-171-7 | 8862561717 |
| ISBN-13 | 978-88-6256-171-6 | 9788862561716 |
| Agency | Italy | |
| Publisher | Salani Editore | |