ISBN
ISBN and Magic Links
ISBN (and PubMed PMID and IEEE RFC) links used to be automatically linked by MediaWiki software, but now you have to explicitly enable them as magic links [1] and also setup a Project namespace page like wp:Book sources [2]
See the local version of Project:Book sources
The 'process'[3] to remove the feature was controversial, but pushed through anyway.
Linking
To create a nice book link on this wiki, use the ISBN as a parameter (path argument) to Special:BookSources
We do not have or use a special template, so just make your own link like [[Special:BookSources/978-1-25763801-7|''The Architecture of Open Source Applications'']] which results in a link like this: The Architecture of Open Source Applications