http://www.craft.ai/blog/bt-101-behavior-trees-grammar-basics/

https://github.com/libgdx/gdx-ai/wiki/Behavior-Trees

https://en.wikipedia.org/wiki/Behavior_Trees_(artificial_intelligence,_robotics_and_control)

http://obviam.net/index.php/game-ai-an-introduction-to-behavior-trees/

http://www.gamasutra.com/blogs/ChrisSimpson/20140717/221339/Behavior_trees_for_AI_How_they_work.php

http://gamedev.stackexchange.com/questions/51693/decision-tree-vs-behavior-tree

http://guineashots.com/2014/07/25/an-introduction-to-behavior-trees-part-1/

https://blog.itu.dk/GAES-E2013/files/2013/09/lim_evogames10.pdf

http://www.cas.kth.se/~petter/Publications/ogren2012bt.pdf

http://www.csc.kth.se/~miccol/Michele_Colledanchise/Publications_files/ICRA14_cmo_final.pdf

http://www.csc.kth.se/~miccol/Michele_Colledanchise/Publications_files/2013_ICRA_mcko.pdf

http://www.csc.kth.se/~miccol/Michele_Colledanchise/Publications_files/IROS14_CO.pdf

https://acetinski.files.wordpress.com/2011/10/behaviour_tree_ai.pdf

http://docs.cryengine.com/display/SDKDOC4/Modular+Behavior+Tree+Nodes

代码

https://code.google.com/p/treesharp/source/checkout

https://github.com/NetGnome/BehaviorLibrary