Dawson and Trapp: Chapters 9, 10, 12.
Gum PA et al (2001) Aspirin use and all-cause mortality among patients being evaluated for known or suspected coronary artery disease: A propensity analysis.
Nicholas J, Gulliford MC (2008) Commentary: What is a propensity score?
Zweig MH, Campbell G (1993)
Receiver-operating characteristic (ROC) plots: a fundamental evaluation tool in clinical medicine.
Wikipedia ROC curves.