Cita APA (7a ed.)

Cook, P. J., & Ludwig, J. (2002). Gun violence: The real cost. University Press.

Cita Chicago Style (17a ed.)

Cook, Philip J., y Jens Ludwig. Gun Violence: The Real Cost. Oxford [etc.]: University Press, 2002.

Cita MLA (9a ed.)

Cook, Philip J., y Jens Ludwig. Gun Violence: The Real Cost. University Press, 2002.