APA
Saffer H., Chaloupka Frank, . (1998). Demographic differentials in the demand for alcohol and illicit drugs. Cambridge, MA: NBER.
Chicago
Saffer Henry, Chaloupka Frank, . 1998. Demographic differentials in the demand for alcohol and illicit drugs. Cambridge, MA: NBER.
Harvard
Saffer H., Chaloupka Frank, . (1998). Demographic differentials in the demand for alcohol and illicit drugs. Cambridge, MA: NBER.
MLA
Saffer Henry, Chaloupka Frank, . Demographic differentials in the demand for alcohol and illicit drugs. Cambridge, MA: NBER. 1998.