Cita APA (7a ed.)

Riley, K. J. (1997). Crack, powder cocaine, and heroin: Drug purchase and use patterns in six US cities. National Institute of Justice [u.a.].

Cita Chicago Style (17a ed.)

Riley, K. Jack. Crack, Powder Cocaine, and Heroin: Drug Purchase and Use Patterns in Six US Cities. Washington, DC: National Institute of Justice [u.a.], 1997.

Cita MLA (8a ed.)

Riley, K. Jack. Crack, Powder Cocaine, and Heroin: Drug Purchase and Use Patterns in Six US Cities. National Institute of Justice [u.a.], 1997.