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Note that the ISBN hyphenation rule-base is a living document. This is a maintenance category of articles with invalid ISBNs. It is often included by means of the template {{Please check ISBN}}. If you fix an ISBN please remove the template or category from the article. Many article/ISBN problems are listed at WikiProject Check Wikipedia.
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 ...
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.
1. Use its ISBN parameter to state explicitly that the ISBN does not exist: |isbn=<!-- ISBN unspecified --> (you must use HTML <!-- --> comment tags to hide the message from the citation processing software) 2. Place {} outside the citation template For free-form reference, just add {} to the end of the citation.
checksum – ISBN has one or more incorrect digits; look for typos and transposition invalid character – ISBN has one or more 'digits' that is not in the allowed set appropriate to ISBN length invalid prefix – 13-digit ISBNs must begin with '978' or '979' invalid form – 10-digit ISBNs with the mis-positioned 'X' character
Some ISBNs may still have been printed correctly elsewhere in the same book or corrected in later editions; if further research shows that to be the case (and that the new ISBN still refers to an edition with the same information on the same pages), then the invalid# parameter should be moved or {{Listed Invalid ISBN}} should be replaced with {}.
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The International Standard Book Number (ISBN) is a numeric commercial book identifier that is intended to be unique. [a] [b] Publishers purchase or receive ISBNs from an affiliate of the International ISBN Agency. [2] A different ISBN is assigned to each separate edition and variation of a publication, but not to a simple reprinting of an ...