[jamesponddotco]

Mind pointing me to an example book in Wikidata? I managed to find a few, but not if I search by ISBN, which makes it hard to find.

Unless you mean the fact you can find the identifier for a book in several different websites in there, in which case, I did find it.

[culi]

you can search by ISBN or any other property of an item. You have to use a SPARQL query https://query.wikidata.org/

I believe there's also a REST API somewhere if you really hate SPARQL

[jamesponddotco]

Thanks, I’ll take a look at that!