*{{Cite journal|last=Pearl|first=Judea|date=2010-02-26|title=An Introduction to Causal Inference|journal=The International Journal of Biostatistics|volume=6|issue=2|pages=Article 7|doi=10.2202/1557-4679.1203|issn=1557-4679|pmc=2836213|pmid=20305706}} | *{{Cite journal|last=Pearl|first=Judea|date=2010-02-26|title=An Introduction to Causal Inference|journal=The International Journal of Biostatistics|volume=6|issue=2|pages=Article 7|doi=10.2202/1557-4679.1203|issn=1557-4679|pmc=2836213|pmid=20305706}} |