ISBN 963797881 was input with 9 digits (one digit too few).
The ISBN 963797881 that you entered has got 9 digits, i.e. one digit is missing to make 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 9 numerically correct ISBN out of which the ISBN that you input coule have resulted by a single error (dropping one 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: Hungary
ISBNas­su­med er­rorCatalogs for checking
963-479-788-1fourth digit was drop­ped. amazon.co.uk amazon.com amazon.de
963-7974-88-1seven­th digit was drop­ped. amazon.co.uk amazon.com amazon.de
963-7978-80-1ninth digit was drop­ped. amazon.co.uk amazon.com amazon.de
963-7978-81-Xtenth digit was drop­ped. amazon.co.uk amazon.com amazon.de
963-7997-88-1fifth digit was drop­ped.
or
sixth digit was drop­ped.		 amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Mexico
ISBNas­su­med er­rorCatalogs for checking
968-37-9788-1third digit was drop­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Cyprus
ISBNas­su­med er­rorCatalogs for checking
9963-7978-8-1first digit was drop­ped.
or
second digit was drop­ped.		 amazon.co.uk amazon.com amazon.de

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