I liked "The Art of Prolog" for learning. And then if you dive deeper, "The Craft of Prolog". I'm curiously amused that the price for used versions on Amazon is so high.
I did some further research and it seems like The Art of Prolog gets the most love even though it's from the mid-nineties - and still hella expensive like you say!
The only thing I'm wondering about are skipping any important developments made in the last 25 years, but I guess I can always jump into the more up-to-date online resources by then.
The only thing I'm wondering about are skipping any important developments made in the last 25 years, but I guess I can always jump into the more up-to-date online resources by then.