Editing Encyclopedia:ISBN (section)

==Types==

ISBNs come in two styles, containing 10 digits or 13 digits, and are known as "ISBN-10" and "ISBN-13" numbers. '''Please use the ISBN-13 if both are provided by the original work'''. The ISBN-13 is often found near the barcode and will start with either 978- or 979-. However, if an older work only lists an ISBN-10, use that in citations instead of calculating an ISBN-13 for it. 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 check digit value.
* [[User:Nihiltres|Nihiltres]]' [https://ataraxic.net/isbn-tool/ ISBN tool]
* [https://www.loc.gov/publish/pcn/isbncnvt_pcn.html ISBN converter of the U.S. Library of Congress]
* [http://www.isbn.org/converterpub.asp ISBN converter of ISBN.org]

Stylistically, please:
* Use 13-digit ISBNs, if both are provided by the original work, as these are now standard as of January 1, 2007, and issued to new books.
* Use hyphens if they are included, as they divide the number into meaningful parts. The placement of hyphens varies depending on the value of the ISBN.

Here is [http://www.amazon.com/dp/1413304540 an example of a book listing]. Look on that page under "product details." There one can find these two ISBNs for that book: 
:ISBN-10: 1413304540
:ISBN-13: 978-1413304541
:*<code><nowiki>{{ISBN|1413304540}}</nowiki></code> &nbsp; produces {{ISBN|1413304540}}
:* <code><nowiki>{{ISBN|978-1413304541}}</nowiki></code> &nbsp; produces {{ISBN|978-1413304541}}

Using "Click to Look Inside!" (a feature of the listing available above the cover picture) reveals that the proper hyphen placement is:
:ISBN-10: 1-4133-0454-0
:*<code><nowiki>{{ISBN|1-4133-0454-0}}</nowiki></code> &nbsp; produces {{ISBN|1-4133-0454-0}}
:* <code><nowiki>{{ISBN|978-1-4133-0454-1}}</nowiki></code> &nbsp; produces {{ISBN|978-1-4133-0454-1}}

In tables (or other applications) where the letters ISBN would be redundant, the [[:template:ISBNT|ISBNT]] template may be used instead.
* {{Tlx|ISBNT|1-4133-0454-0}} &nbsp; produces {{ISBNT|1-4133-0454-0}}
* {{Tlx|ISBNT|978-1-4133-0454-1}} &nbsp; produces {{ISBNT|978-1-4133-0454-1}}