Relationship Multiple Select: how to link each separately

If I have a book with two authors in a relationship field with multiple select option, how do I put a link on both of the authors pointing to each of their pages.

This is what I put in the book template:
<a href="{@book_author.guid}">{@book_author}</a>

But when there are more than one authors, the result is this
<a href="https://mysite.com/author1 and https://mystie.com/author2">Author 1 and author 2"</a>

Everything is thrown together in one big href mess up. How can I fix this?