Ludwig, J., & Cook, P. J. (1999). The benefits of reducing gun violence: Evidence from contingent-valuation survey data. National Bureau of Economic Research.
Цитирование в стиле Чикаго (17-е изд.)Ludwig, Jens, и Philip J. Cook. The Benefits of Reducing Gun Violence: Evidence from Contingent-valuation Survey Data. Cambridge: National Bureau of Economic Research, 1999.
Цитирование MLA (9-е изд.)Ludwig, Jens, и Philip J. Cook. The Benefits of Reducing Gun Violence: Evidence from Contingent-valuation Survey Data. National Bureau of Economic Research, 1999.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.