Chaloupka, F. J. (1998). The demand for cocaine and marijuana by youth. National Bureau of Economic Research.
Chicago Style (17. basım) AtıfChaloupka, Frank J. The Demand for Cocaine and Marijuana by Youth. Cambride: National Bureau of Economic Research, 1998.
MLA (9th ed.) AtıfChaloupka, Frank J. The Demand for Cocaine and Marijuana by Youth. National Bureau of Economic Research, 1998.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..