Cita APA (7a ed.)

Nahas, G. G. (1979). Keep off the grass: A scientific enquiry into the biological effects of marijuana (Rev. ed.). Pergamon Press.

Cita Chicago Style (17a ed.)

Nahas, Gabriel G. Keep off the Grass: A Scientific Enquiry into the Biological Effects of Marijuana. Rev. ed. Oxford New York: Pergamon Press, 1979.

Cita MLA (9a ed.)

Nahas, Gabriel G. Keep off the Grass: A Scientific Enquiry into the Biological Effects of Marijuana. Rev. ed. Pergamon Press, 1979.