APA
Mehay S. L., Pacula R. L., . (1999). The effectiveness of workplace drug prevention policies : does 'zero tolerance' work?. Cambridge, Mass: National Bureau of Economic Research.
Chicago
Mehay Stephen L, Pacula Rosalie Liccardo, . 1999. The effectiveness of workplace drug prevention policies : does 'zero tolerance' work?. Cambridge, Mass: National Bureau of Economic Research.
Harvard
Mehay S. L., Pacula R. L., . (1999). The effectiveness of workplace drug prevention policies : does 'zero tolerance' work?. Cambridge, Mass: National Bureau of Economic Research.
MLA
Mehay Stephen L, Pacula Rosalie Liccardo, . The effectiveness of workplace drug prevention policies : does 'zero tolerance' work?. Cambridge, Mass: National Bureau of Economic Research. 1999.