Chaloupka, F. J. (1999). Do higher cigarette prices encourage youth to use marijuanan. National Bureau of Economic Research.
Cita Chicago (17th ed.)Chaloupka, Frank J. Do Higher Cigarette Prices Encourage Youth to Use Marijuanan. Cambridge: National Bureau of Economic Research, 1999.
Cita MLA (9th ed.)Chaloupka, Frank J. Do Higher Cigarette Prices Encourage Youth to Use Marijuanan. National Bureau of Economic Research, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.