APA
Silverman K., Robles E., . (1998). Employment as a drug abuse treatment intervention : a behavioral economic analysis. Cambridge, Mass: National Bureau of Economic Research.
Chicago
Silverman Kenneth, Robles Elias, . 1998. Employment as a drug abuse treatment intervention : a behavioral economic analysis. Cambridge, Mass: National Bureau of Economic Research.
Harvard
Silverman K., Robles E., . (1998). Employment as a drug abuse treatment intervention : a behavioral economic analysis. Cambridge, Mass: National Bureau of Economic Research.
MLA
Silverman Kenneth, Robles Elias, . Employment as a drug abuse treatment intervention : a behavioral economic analysis. Cambridge, Mass: National Bureau of Economic Research. 1998.