Cita APA (7a ed.)

Harper, R., & Murphy, R. (1999). Drug smuggling: An analysis of the traffickers 1991 - 1997. Middlesex Probation Service.

Cita Chicago Style (17a ed.)

Harper, Rosalyn, y Rachel Murphy. Drug Smuggling: An Analysis of the Traffickers 1991 - 1997. London: Middlesex Probation Service, 1999.

Cita MLA (9a ed.)

Harper, Rosalyn, y Rachel Murphy. Drug Smuggling: An Analysis of the Traffickers 1991 - 1997. Middlesex Probation Service, 1999.