Angrist, Joshua D., and Jörn-Steffen Pischke. Mastering Metrics: The Path from Cause to Effect, 2015.
Joshua D. Angrist and Jörn-Steffen Pischke, Mostly Harmless Econometrics
Imbens, Guido W., and Donald B. Rubin. Causal Inference for Statistics, Social, and Bio-medical Sciences: An Introduction. New York: Cambridge University Press, 2015.
Cunningham, Scott. Causal Inference: The Mixtape