This is the inevitable standard reference: http://aima.cs.berkeley.edu/ http://aima.cs.berkeley.edu/ Another textbook, often linked on HN, and freely available

This is the inevitable standard reference: http://aima.cs.berkeley.edu/ http://aima.cs.berkeley.edu/ Another textbook, often linked on HN, and freely available online: http://artint.info/ http://artint.info/