Saffer, H., & Chaloupka, F. (1999). State drug control spending and illicit drug participation. National Bureau of Economic Research.
Citazione stile Chigago Style (17a edizione)Saffer, Henry, e Frank Chaloupka. State Drug Control Spending and Illicit Drug Participation. Cambridge: National Bureau of Economic Research, 1999.
Citatione MLA (9a ed.)Saffer, Henry, e Frank Chaloupka. State Drug Control Spending and Illicit Drug Participation. National Bureau of Economic Research, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.