APA (7 ম সংস্করণ) উদ্ধৃতি

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

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

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

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

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