ISBN 80858390914 was input with 11 digits (one digit too much)
The ISBN 80858390914 that you input has 11 digits, i.e. one digit more than a valid ISBN. You can find information on the format of an ISBN on the home page of this site. This site has found the following 4 numerically correct ISBN out of which the ISBN that you input could have resulted by a single error (adding one extraneous digit). You can now check out these suggestions in the databases of the following booksellers' sites: amazon.co.uk (UK), amazon.com (USA) and amazon.de (Germany). Additional sites to search by ISBN (in this case, in catalogs of libraries) are e.g. the Library of Congress (USA) or the search gateway of the Deutsche Bibliothek. To the home page
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ISBN prefix group: English language
ISBNas­su­med er­rorCatalogs for checking
0-85839-091-4first digit was ad­ded. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-85390-91-4fifth digit was ad­ded. amazon.co.uk amazon.com amazon.de
80-85830-91-4seven­th digit was ad­ded. amazon.co.uk amazon.com amazon.de
80-85839-09-1eleven­th digit was ad­ded. amazon.co.uk amazon.com amazon.de

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