Cita APA (7a ed.)

Petry, N. M., & Bickel, W. K. (1998). A behavioral economic analysis of polydrug abuse in heroin addicts. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Petry, Nancy M., y Warren K. Bickel. A Behavioral Economic Analysis of Polydrug Abuse in Heroin Addicts. Cambridge, MA: National Bureau of Economic Research, 1998.

Cita MLA (9a ed.)

Petry, Nancy M., y Warren K. Bickel. A Behavioral Economic Analysis of Polydrug Abuse in Heroin Addicts. National Bureau of Economic Research, 1998.