Ludwig, J., & Cook, P. J. (2003). Evaluating gun policy: Effects on crime and violence. Brookings Institution Press.
芝加哥风格引文Ludwig, Jens, 与 Philip J. Cook. Evaluating Gun Policy: Effects on Crime and Violence. Washington, D.C.: Brookings Institution Press, 2003.
MLA引文Ludwig, Jens, 与 Philip J. Cook. Evaluating Gun Policy: Effects on Crime and Violence. Brookings Institution Press, 2003.
警告：这些引文格式不一定是100％准确.