ISBN 753660020 was input with 9 digits (one digit too few).

The ISBN 753660020 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 8 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: (UK), (USA) and (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
7-5306-6002-0fourth digit was drop­ped.
7-5366-0020-8tenth digit was drop­ped.
7-5366-0024-0ninth digit was drop­ped.
7-5366-0072-0eighth digit was drop­ped.
7-5366-0802-0seven­th digit was drop­ped.
7-5366-2002-0sixth digit was drop­ped.
7-7536-6002-0first digit was drop­ped.
second digit was drop­ped.

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