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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 Library of Congress catalogue contains books published with invalid ISBNs, which it usually tags with the phrase "Cancelled ISBN". [54] The International Union Library Catalog (a.k.a., WorldCat OCLC —Online Computer Library Center system) often indexes by invalid ISBNs, if the book is indexed in that way by a member library.
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 ...
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.
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 {}.
I checked this book at Library of Congress. There is no ISBN shown there, nor at Worldcat. (Which is the trick Worldcat often uses when the ISBN is not valid). Anyone object if we remove the invalid ISBN? EdJohnston 18:32, 11 January 2007 (UTC) Not me. Listing a flawed ISBN is a disservice, if anything. Limn 18:44, 11 January 2007 (UTC)
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.
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.