Chaloupka, F. J. (1998). The demand for cocaine and marijuana by youth. National Bureau of Economic Research.
Cita Chicago (17th ed.)Chaloupka, Frank J. The Demand for Cocaine and Marijuana by Youth. Cambride: National Bureau of Economic Research, 1998.
Cita MLA (9th ed.)Chaloupka, Frank J. The Demand for Cocaine and Marijuana by Youth. National Bureau of Economic Research, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.