Cita APA

Godfrey, M., West, D., Parker, S., Weston-Baker, C., & Harper, P. (1987). Understanding drugs: Heroin. New York, United States: Franklin Watts.

Citación estilo Chicago

Godfrey, Marin, David West, Steve Parker, Cecilia Weston-Baker, y Peter Harper. Understanding Drugs: Heroin. New York, United States: Franklin Watts, 1987.

Cita MLA

Godfrey, Marin, et al. Understanding Drugs: Heroin. New York, United States: Franklin Watts, 1987.