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Joshua D. Angrist , and Jorn-Steffen Pischke . 2010. “The Credibility Revolution in Empirical Economics: How Better Research Design Is Taking the Con out of Econometrics.” Journal of Economic Perspectives 24 (2): 3–30.
William G. Cochran , and S. Paul Chambers . 1965. “The Planning of Observational Studies of Human Populations.” Journal of Royal Statistical Society, Series A 128 (2): 234–65.
Luke J. Keele , and William Minozzi . 2012. “How Much Is Minnesota Like Wisconsin? Assumptions and Counterfactuals in Causal Inference with Observational Data.” Political Analysis 21 (2): 193–216.