Judea Pearl: The Art and Science of Cause and Effect(bayes.cs.ucla.edu)
bayes.cs.ucla.edu
Judea Pearl: The Art and Science of Cause and Effect
http://bayes.cs.ucla.edu/LECTURE/lecture_sec1.htm
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The book (Causality: Models, Reasoning, and Inference) to which this is the epilogue is excellent, I cant recommend it strongly enough.