Actually, in the three years since I posted this, it has become more difficult to tell which books have been written by space aliens instead of human beings. But the examples provided still hold true.
https://leeduigon.com/2015/09/23/how-to-tell-if-the-book-youre-reading-was-written-by-a-space-alien/
Thing is, more and more people nowadays behave like space aliens! I mean, would genuine earth people sit together around a table, on the sidewalk outside the pizza parlor, and instead of talking with each other, just sit there transfixed by some electronic doodad? (Please say I’m right.)