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I recorded a quick video response:
https://www.awesomescreenshot.com/video/11093493?key=7cddec6397bd2db38ecdfc5a3f0fc51e
Do you have access to Google Search Console? It used to be called Webmaster Tools. It’s Google’s way of verifying that you own your website. It might be that your webmaster set it up (and you might need to ask for access) or you might need to set it up once and then you can claim the Knowledge Panel.
In either case, since the panel is driven by your website, be sure your books are in there using the schema!