https://www.amazon.com/Godels-Theorem-Simplified-Harry-Gensl...
http://www.amazon.com/Godels-Theorem-Simplified-Harry-Gensle...
http://www.amazon.com/Godels-Theorem-Simplified-Harry-Gensle...
"Godel, Escher, Bach" is another interesting read, but that volume does have a lot of extraneous fluff.
https://www.amazon.com/Godels-Theorem-Simplified-Harry-Gensl...