Cita APA (7a ed.)

Ball, J. C., Chambers, C. D., & Ball, M. J. (1968). Association of Marihuana Smoking with Opiate Addiction in the United States.

Cita Chicago Style (17a ed.)

Ball, John C., Carl D. Chambers, y Marion J. Ball. Association of Marihuana Smoking with Opiate Addiction in the United States. 1968.

Cita MLA (9a ed.)

Ball, John C., et al. Association of Marihuana Smoking with Opiate Addiction in the United States. 1968.