http://www.amazon.com/Art-Prolog-Second-Programming-Techniqu... (if you click on the used link there is a hardback going for 13 bucks right now)
http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&... (they use asp..? regardless brand new hardback for 65)
http://www.amazon.com/Art-Prolog-Second-Programming-Techniqu... (if you click on the used link there is a hardback going for 13 bucks right now)
http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&... (they use asp..? regardless brand new hardback for 65)