The following books are recommended:
Imbens, Guido W. and Rubin, Donald B. (2015). Causal Inference for Statistics, Social, and
Biomedical Sciences: An Introduction, Cambridge University Press.
Angrist, Joshua D. and Pischke, Jorn-Steffen. (2009). Mostly Harmless Econometrics: An
Empiricist’s Companion, Princeton University Press.