Cita APA (7a ed.)

Grigg, D. (1974). The Agricultural systemsof the world;an evolutionary approach (1st edition.). Cambridge University Press.

Cita Chicago Style (17a ed.)

Grigg, D.B. The Agricultural Systemsof the World;an Evolutionary Approach. 1st edition. [Lugar de publicación no identificado]: Cambridge University Press, 1974.

Cita MLA (8a ed.)

Grigg, D.B. The Agricultural Systemsof the World;an Evolutionary Approach. 1st edition. Cambridge University Press, 1974.