I have read books that after the end of the story had a page or two listing similar books. I would classify that as an ad, but I also consider it the kind of re

I have read books that after the end of the story had a page or two listing similar books. I would classify that as an ad, but I also consider it the kind of respectful and tasteful advertisement that benefits both the publisher and reader. Here's what I like about it: * it doesn't interrupt me when I'm in the middle of something, rather it comes at just the moment when I'm the most interested in purchasing a new book * it's just black normal font-size on white background, nothing screaming or annoying. * it's curated and decent quality recommendations rather than whoever-pays-the-most.