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== Sources ==
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== ==
 
* {{Cite book|url={{google books |plainurl=y |id=LLkhAwAAQBAJ}}|title=Causality|last=Pearl|first=Judea|date=2009-09-14|publisher=Cambridge University Press|isbn=9781139643986|language=en}}
 
* {{Cite book|url={{google books |plainurl=y |id=LLkhAwAAQBAJ}}|title=Causality|last=Pearl|first=Judea|date=2009-09-14|publisher=Cambridge University Press|isbn=9781139643986|language=en}}
  
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