| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 88-7782-702-5 | 8877827025 |
| ISBN-13 | 978-88-7782-702-9 | 9788877827029 |
| 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 | 88-8451-610-2 | 8884516102 |
| ISBN-13 | 978-88-8451-610-7 | 9788884516107 |
| Agency | Italy | |
| Publisher | Salani Editore | |
| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 88-6256-032-X | 886256032X |
| ISBN-13 | 978-88-6256-032-0 | 9788862560320 |
| Agency | Italy | |
| Publisher | Salani Editore | |
| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 88-6256-135-0 | 8862561350 |
| ISBN-13 | 978-88-6256-135-8 | 9788862561358 |
| Agency | Italy | |
| Publisher | Salani Editore | |