Widget for adding HTML markup to a page

If you want to do it the “WordPress-way”, you would create a custom post-type for books called “book” ( For this take a look at https://codex.wordpress.org/Function_Reference/register_post_type ). Then you would create an archive page for that post-type called “archive-book.php”.

I hope this helps a little bit. If you need more help, let me know.