Currently open library is used by Zotero to search for ISBNs, however we have additional capability in citoid to search for the title of a work.
Historically we used worldcat (T352571) to perform a title or citation lookup, however now we only search crossRef.
But most books are not in crossRef, so the results are irrelevant if the person is looking for a non-academic book.
This API would work: https://openlibrary.org/dev/docs/api/search
- Enable open library look up for open search
- Then rank resulting citations by similarity to original input