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invalid form – 10-digit ISBNs with the mis-positioned 'X' character invalid group id – 13-digit ISBN begins with '9790'; this prefix / group ID combination is reserved to ISMN. To resolve this error, ensure that the |isbn= value is correct, that only one ISBN is used, that the proper optional separators are used, and that no other text is ...
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 ...
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:
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OTOH, contributors with an ISBN from the book in their hand may feel obligated to add the ISBN to the article. Perhaps we could create a template {{Invalid ISBN|2-204-19850-9}} that results in <!-- Invalid ISBN: 2-204-19850-9 -->. Would that cause google searchs for the invalid ISBN to bring up the article?
Do not convert a 10-digit ISBN to 13-digit by just adding the 978 prefix; the last digit is a calculated check digit and just making changes to the numbers will make the ISBN invalid. This parameter should hold only the ISBN without any additional characters. It is checked for length, invalid characters – anything other than numbers, spaces ...
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