Cita APA (7a ed.)

Hafen, B. Q., & Frandsen, K. J. (1980). Marijuana: Facts, figures and information for the 1980's. Hazelden.

Cita Chicago Style (17a ed.)

Hafen, Brent Q., y Kathryn J. Frandsen. Marijuana: Facts, Figures and Information for the 1980's. Center City, Mn: Hazelden, 1980.

Cita MLA (8a ed.)

Hafen, Brent Q., y Kathryn J. Frandsen. Marijuana: Facts, Figures and Information for the 1980's. Hazelden, 1980.