APA (7th ed.) Citation

Levitt, S. D., & Porter, J. (1999). Sample selection in the estimation of air bag and seat belt effectiveness. National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Levitt, Steven D., and Jack Porter. Sample Selection in the Estimation of Air Bag and Seat Belt Effectiveness. Cambridge, Mass: National Bureau of Economic Research, 1999.

MLA (9th ed.) Citation

Levitt, Steven D., and Jack Porter. Sample Selection in the Estimation of Air Bag and Seat Belt Effectiveness. National Bureau of Economic Research, 1999.