I have no idea. We mostly glossed over it in class, but I had been given a copy of Gödel Escher Bach at some point so I dove a little deeper. My personal preference is Nagel's book which is short and clear (and you can probably find a digital version)
This was very much a theme of the way we were taught, there is no possible way to go into anything in depth in a lecture, if something sparked interest then we were supposed to read up on it, write a paper, and get criticized. Some classes had reading lists with well over a hundred books on them
