| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 3-551-55193-6 | 3551551936 |
| ISBN-13 | 978-3-551-55193-1 | 9783551551931 |
| Agency | German language | |
| Publisher | Carlsen | |
| well-formed | ||
| valid hyphenation | ||
| ISBN-10 | 964-90574-6-3 | 9649057463 |
| ISBN-13 | 978-964-90574-6-0 | 9789649057460 |
| Agency | Iran | |
| Publisher | Jar | |
| not well-formed | |||||||||
| valid hyphenation | |||||||||
| The check-digit is not correct. If the rest of the ISBN is correct (and it may not be), the check digit should be: 3. | |||||||||
| Correcting check-digit gives: 964-90574-6-3 which appears to be valid. The governing agency is: Iran. | |||||||||
| well-formed | ||
| valid hyphenation | ||
| ISBN-10 | 3-551-55300-9 | 3551553009 |
| ISBN-13 | 978-3-551-55300-3 | 9783551553003 |
| Agency | German language | |
| Publisher | Carlsen | |
| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 3-551-35404-9 | 3551354049 |
| ISBN-13 | 978-3-551-35404-4 | 9783551354044 |
| Agency | German language | |
| Publisher | Carlsen | |
| well-formed | ||
| valid hyphenation | ||
| ISBN-10 | 3-86717-066-5 | 3867170665 |
| ISBN-13 | 978-3-86717-066-6 | 9783867170666 |
| Agency | German language | |
| Publisher | Der Hoerverlag DHV | |