What is the best database of books to use?

Question

Database

A pet-application is being made for exchanging books, I want to add a choice of books from the catalog, instead of an arbitrary name. Questions:
1. Where to get the database (to parse the site, open API, maybe on a torrent where it is)
2. How to organize, not such a fundamental question, but maybe someone will tell you, I know about ISBN.

Answer 1

You can parse any of the top 5 book books. By the
way, your application reminded me of
a very brazen proposal to make such a detailed test task for a junior position:
https://docs.google.com/document/d/17jn0PiBtkjfRX5...

Answer 2

You same popular books, not scientific? Flibusta won't work? Right there with the texts. :-)