Cita APA (7a ed.)

Klages, K. H. (1942). Ecological crop geography (1st edition.). Macmillan.

Cita Chicago Style (17a ed.)

Klages, Karl H.W. Ecological Crop Geography. 1st edition. New York: Macmillan, 1942.

Cita MLA (8a ed.)

Klages, Karl H.W. Ecological Crop Geography. 1st edition. Macmillan, 1942.