From there I made several instant friendships with an amazing group of pet enthusiasts and pet bloggers and now I can proudly call myself an author of a popular and fun dog blog. (mybrownnewfies.com)
It's even more confusing for us authors who are trying to decide where our books fit in, as most books can probably fit into several of these categories. (reneescattergood.com)
The context of the sentence leads us to hope the reference is to the writers of the letter, whereas the structure of the sentence makes it the authors of the books. (wattsupwiththat.com)