| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 88-7782-852-8 | 8877828528 |
| ISBN-13 | 978-88-7782-852-1 | 9788877828521 |
| 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 | 88-8451-612-9 | 8884516129 |
| ISBN-13 | 978-88-8451-612-1 | 9788884516121 |
| Agency | Italy | |
| Publisher | Salani Editore | |