註解：
摩坎的原文姓名是Naci Mocan
沃弗斯的原文姓名應該是Justin Wolfers
桑斯坦的原文姓名應該是Cass Sunstein
文中提到的Naci Mocan對死刑嚇阻效果的研究：
Mocan, H. Naci, and R. Kaj Gittings. “Getting off Death Row: Commuted Sentences and the Deterrent Effect of Capital Punishment.” The Journal of Law & Economics 46, no. 2 (2003): 453–78.
Naci H. Mocan and R. Kaj Gittings, "The Impact of Incentives on Human Behavior: Can We Make It Disappear? The Case of the Death Penalty," NBER Working Paper 12631 (2006),
文中提到的艾默里大學學者對死刑嚇阻效果的研究：
Dezhbakhsh, Hashem and Rubin, Paul H. and Shepherd, Joanna M., Does Capital Punishment Have a Deterrent Effect? New Evidence from Post-Moratorium Panel Data (October 2003). Available at SSRN:
or
文中提到的休士頓大學對死刑嚇阻效果的研究：
Cloninger, Dale O., and Roberto Marchesini. 2006. “Execution Moratoriums, Commutations and Deterrence: The Case of Illinois.” Applied Economics 38 (9): 967–73. doi:10.1080/00036840500462020.
桑斯坦的「極刑是道德上需要的嗎？」原文全文：
