Many of the Wikipedia articles have [[International Standard Book Number]]s (ISBN) alongside the [[Bibliography|bibliographical]] entry for books. Clicking on the 10 or 13 digit number allows readers to automatically check to see if that particular book is in a [[library]] catalogue, at [[Google Books]], at major booksellers, or other websites.
An example of a bibliographical entry would look like this:
पंक्ति 16:
{{refend}}
The ISBN may not have the dashes between numbers and there mymay be spaces but it workworks in the same manner. Note that different editions of the same book may have different ISBNs and books published prior to the 1970s do not have ISBNs.
