Cita APA (7a ed.)

Ludwig, J., & Cook, P. J. (1999). The benefits of reducing gun violence: Evidence from contingent-valuation survey data. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Ludwig, Jens, y Philip J. Cook. The Benefits of Reducing Gun Violence: Evidence from Contingent-valuation Survey Data. Cambridge, MA: National Bureau of Economic Research, 1999.

Cita MLA (9a ed.)

Ludwig, Jens, y Philip J. Cook. The Benefits of Reducing Gun Violence: Evidence from Contingent-valuation Survey Data. National Bureau of Economic Research, 1999.