ISBN 156045068 was input with 9 digits (one digit too few).
The ISBN 156045068 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: 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
1-5160-4506-8third digit was drop­ped. amazon.co.uk amazon.com amazon.de
1-56044-506-8fifth digit was drop­ped.
or
sixth digit was drop­ped.		 amazon.co.uk amazon.com amazon.de
1-56045-056-8eighth digit was drop­ped. amazon.co.uk amazon.com amazon.de
1-56045-068-1tenth digit was drop­ped. amazon.co.uk amazon.com amazon.de
1-56045-106-8seven­th digit was drop­ped. amazon.co.uk amazon.com amazon.de
1-56504-506-8fourth digit was drop­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: India
ISBNas­su­med er­rorCatalogs for checking
81-560-4506-8first digit was drop­ped. amazon.co.uk amazon.com amazon.de

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