The best way to share your Book Creator book is to publish it online.
Publishing your book online will you give you a link to a read-only version of the book. You can turn the pages, play audio and video, and click on any hyperlinks.
The URL for your book is private - it's not publicly searchable on Google. And you can choose who you want to share it with.
Here's the process:
You'll see that once a book is published, a globe icon appears in the top right corner of the book. From here you can view the book online, copy the URL link to the book (to send to someone else) or unpublish the book.