* {{cite book |ref=what_if |last1=Hernán |first1=MA |author-link1=Miguel Hernán |last2=Robins |first2=JM |author-link2=James Robins |title=Causal Inference: What If |location=Barnsley |publisher=Boca Raton: Chapman & Hall/CRC |date=2020-01-21|url=https://www.hsph.harvard.edu/miguel-hernan/causal-inference-book/}} | * {{cite book |ref=what_if |last1=Hernán |first1=MA |author-link1=Miguel Hernán |last2=Robins |first2=JM |author-link2=James Robins |title=Causal Inference: What If |location=Barnsley |publisher=Boca Raton: Chapman & Hall/CRC |date=2020-01-21|url=https://www.hsph.harvard.edu/miguel-hernan/causal-inference-book/}} |