Cita APA (7th ed.)

Levitt, S. D., & Porter, J. (1999). Estimating the effect of alcohol on driver risk using only fatal accident statistics. National Bureau of Economic Research.

Cita Chicago (17th ed.)

Levitt, Steven D., i Jack Porter. Estimating the Effect of Alcohol on Driver Risk Using Only Fatal Accident Statistics. Cambridge: National Bureau of Economic Research, 1999.

Cita MLA (9th ed.)

Levitt, Steven D., i Jack Porter. Estimating the Effect of Alcohol on Driver Risk Using Only Fatal Accident Statistics. National Bureau of Economic Research, 1999.