ISBN tester and formatter
If a publisher is marked Selbstverlag it is an author-publisher.
✔ Input: 0801870380
✔ ISBN-10: 0-8018-7038-0
✔ Test, whether ISBN is used: 0-8018-7038-0
✔ ISBN-13: 978-0-8018-7038-5
✔ Test, whether ISBN is used: 978-0-8018-7038-5
✔ Group: English speaking area
✔ Publisher: The Johns Hopkins University Press

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