Cita APA (7th ed.)

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.