Cita APA (7th ed.)

Ludwig, J., & Cook, P. J. (2003). Evaluating gun policy: Effects on crime and violence. Brookings Institution Press.

Cita Chicago (17th ed.)

Ludwig, Jens, i Philip J. Cook. Evaluating Gun Policy: Effects on Crime and Violence. Washington, D. C: Brookings Institution Press, 2003.

Cita MLA (9th ed.)

Ludwig, Jens, i Philip J. Cook. Evaluating Gun Policy: Effects on Crime and Violence. Brookings Institution Press, 2003.