ISBN 97887040256 was input with 11 digits (one digit too much)
The ISBN 97887040256 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: China, People's Republic
ISBNas­su­med er­rorCatalogs for checking
7-88704-025-6first digit was ad­ded. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Nigeria
ISBNas­su­med er­rorCatalogs for checking
978-70402-5-6third digit was ad­ded.
or
fourth digit was ad­ded.		 amazon.co.uk amazon.com amazon.de
978-8704-02-6tenth digit was ad­ded. amazon.co.uk amazon.com amazon.de

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