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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 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=July 2024}} to the end of the citation. With either method or format, it will render a [ISBN missing] inline note.
This template accepts three parameters; one unnamed and two named: |1= (unnamed parameter) – (required) the ISBN to be formatted |separator= – (optional) accepts one predefined keyword: space; when |separator=space, the rendered ISBN elements are separated using a space character; for any other value, this template renders with hyphen separators
Citation Style 1 and Citation Style 2 templates that contain |isbn= are checked to ensure that the ISBN is the proper length (ten or thirteen digits), that the ISBN uses the correct optional separators (simple space or hyphen), and that the final check digit is correct according to the ISBN specification.
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 ...
The Citation template generates a citation for a book, periodical, contribution in a collective work, or a web page. It determines the citation type by examining which parameters are used. Template parameters This template has custom formatting. Parameter Description Type Status Last name last last1 author author1 author1-last author-last surname1 author-last1 subject1 surname host subject The ...
This template should not be used in citation templates such as Citation Style 1 and Citation Style 2, because it includes markup that will pollute the COinS metadata they produce; see Wikipedia:COinS.
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.