Implementations in statistics packages Propensity score matching

^ ho, daniel; imai, kosuke; king, gary; stuart, elizabeth (2007). matching nonparametric preprocessing reducing model dependence in parametric causal inference . political analysis. 15 (3): 199–236. doi:10.1093/pan/mpl013. 
^ matchit: nonparametric preprocessing parametric casual inference . r project. 
^ gelman, andrew; hill, jennifer (2007). data analysis using regression , multilevel/hierarchical models. new york: cambridge university press. pp. 206–212. isbn 978-0-521-68689-1. 
^ parsons, lori. performing 1:n case-control match on propensity score (pdf). sugi 29: sas institute. retrieved june 10, 2016. 
^ implementing propensity score matching estimators stata. lecture notes 2001
^ leuven, e.; sianesi, b. (2003). psmatch2: stata module perform full mahalanobis , propensity score matching, common support graphing, , covariate imbalance testing . 
^ teffects psmatch — propensity-score matching (pdf). stata manual.