Books can be attributed to "Unknown" when the author or editor (as applicable) is not known and cannot be discovered. If at all possible, list at least one actual author or editor for a book instead of using "Unknown".
Books whose authorship is purposefully withheld should be attributed instead to Anonymous.
I stopped half way through, I just wasn't loving it. I didn't like any of the characters. It was interesting enough, but I just could NOT get into for some reason. The book itself was also very crass, which I don't enjoy, that might have been off putting enough.