Cita APA

Earp, J. R. (1939). Marihuana: America's New Drug Problem.

Chicago Style Citation

Earp, J. Rosslyn. Marihuana: America's New Drug Problem. 1939.

Cita MLA

Earp, J. Rosslyn. Marihuana: America's New Drug Problem. 1939.

Atenció: Aquestes cites poden no estar 100% correctes.