I recently started reading http://www.learnprolognow.org/ http://www.learnprolognow.org/ and the first few chapters have been excellent. There are exercises and

I recently started reading http://www.learnprolognow.org/ http://www.learnprolognow.org/ and the first few chapters have been excellent. There are exercises and practical sections at the end of each chapter too (unfortunately I haven't had time to look at them in detail yet).