The Total Beginner's Guide to Game AI
Just posted this in another thread, but it’s especially relevant here:I work at a small AI startup, and our CEO worked on the AI for the NPCs in F.E.A.R. [0]. He has written about developing the goal-oriented action planning [1] approach in the game (and is linked to in this article). Great to see how it was done![0]: https://en.wikipedia.org/wiki/F.E.A.R. 
[1]: http://alumni.media.mit.edu/~jorkin/gdc2006_orkin_jeff_fear....