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The inclusion of text other than the digits of an ISBN in |isbn= corrupts the citation's COinS metadata and the citation's link to Special:BookSources. With a free-form reference, just append {{ISBN missing|date=December 2024}} to the end of the citation. With either method or format, it will render a [ISBN missing] inline note.
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 ...
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
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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
Main page; Contents; Current events; Random article; About Wikipedia; Contact us
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This is because ISBNs are often used as search strings and checksum differences between the two forms make it difficult to find items listed only under the other type. ISBN-10 and ISBN-13 use different check digit algorithms to compute the last digit of the ISBN. The following tools will convert any ISBN-10 to an ISBN-13 along with the correct ...