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This page allows users to search for multiple sources for a book given the 10- or 13-digit ISBN number. Spaces and dashes in the ISBN number do not matter.
This page links to catalogs of libraries, booksellers, and other book sources where you will be able to search for the book by its International Standard Book Number (ISBN).
Google Books and Amazon.com may be particularly helpful if you want to verify citations in Wikipedia articles, because they often enable you to search an online version of the book for specific words or phrases, or you can browse through the book (although for copyright reasons the entire book is usually not available).
If the book you are looking for is in a language other than English, you might find it helpful to look at the equivalent pages on other Wikipedias, linked below – they are more likely to have sources appropriate for that language.
These links produce citations in various referencing styles.
You can look up ISBNs for different editions of the same book, hardback or paperback, first print or a reprint, even re-editions where the title has changed using xISBN. xISBN's linkages are determined algorithmically, based on the concepts of the Functional Requirements for Bibliographic Records.
You can also convert between 10 and 13 digit ISBN numbers with these tools:
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