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If the ISBN is failing to validate, it is likely that there is a typo in the main part of the number. In this case, recalculating the check digit results in an apparently valid ISBN that leads to the wrong source (or to nowhere). If you only have a 10-digit ISBN, do use the number as-is, do not try to convert it to the 13-digit form. If the ...
Do not remove the {{ISBN missing}} template without fixing the problem in one of the following ways: Determine the ISBN, add it to the reference, then remove the {{ISBN missing}} template; For a reference formatted via a Citation Style 1 template, use its ISBN parameter: |isbn=X-XXXX-XXXX-X For a free-form reference:
The template takes as argument a valid ISBN and yields the formatted version of that ISBN. Any existing hyphens in the ISBN are ignored, whether or not they are correctly placed: {{format ISBN|97-8-1-57181655-9}} → 978-1-57181-655-9 {{Format ISBN}} is intended to be substituted so that the template call in wikitext is replaced with the ...
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The ISBN may have been incorrectly labelled invalid, but we have (to our surprise) found several examples where the publisher has put an invalid number on the book (see talk page for examples). Note that just because a number has not been identified as invalid, it doesn't mean it corresponds to the book in question, or indeed any book.
isbn: International Standard Book Number; for example: 978-0-8126-9593-9. (See Wikipedia:ISBN and ISBN § Overview.) Hyphens in the ISBN are optional, but preferred. Use the ISBN actually printed on or in the book. Use the 13-digit ISBN – beginning with 978 or 979 – when it is available. If only a 10-digit ISBN is printed on or in the book ...
For example | isbn = {{Listed Invalid ISBN|123-456-7890-123}} is incorrect use. Usage This template should only be used in limited cases when an editor knows that the International Standard Book Number (ISBN) printed in a source publication is invalid.
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