Cook, P. J., & Ludwig, J. (2003). Pragmatic Gun Policy. In J. Ludwig & P. J. Cook (Eds.), Evaluating Gun Policy (pp. 1–37). Washington, DC: Brookings Institution Press.

Cook, P. J., and J. Ludwig. “Pragmatic Gun Policy.” In Evaluating Gun Policy, edited by J. Ludwig and P. J. Cook, 1–37. Washington, DC: Brookings Institution Press, 2003.

Cook PJ, Ludwig J. Pragmatic Gun Policy. In: Ludwig J, Cook PJ, editors. Evaluating Gun Policy. Washington, DC: Brookings Institution Press; 2003. p. 1–37.

Cook, P. J., and J. Ludwig. “Pragmatic Gun Policy.” Evaluating Gun Policy, edited by J. Ludwig and P. J. Cook, Brookings Institution Press, 2003, pp. 1–37.

Cook PJ, Ludwig J. Pragmatic Gun Policy. In: Ludwig J, Cook PJ, editors. Evaluating Gun Policy. Washington, DC: Brookings Institution Press; 2003. p. 1–37.