以下几篇都是很不错的文献

Lalonde, R. (1986), “Evaluating the Econometric Evaluations of Training Programs”, AER 76, 604-620.

Hahn, J. (1998),”On the Role pf the Propensity Score in Efficient Semiparametric Estimation of Average Treatment Effects,” Econometrica 66(2), 315-331.

Abadie, A., and G. Imbens (2001), “A Simple and Bias-corrected Matching Estimator for Average Treatment Effects”, working paper.

Hirano, K., G. Imbens, and G. Ridder (2002), “Efficient Estimation of Average Treatment Effects Using the Estimated Propensity Score”, Working Paper.

教科书可参考

Jeffrey Wooldridge, Econometric Analysis of Cross Section and Panel Data