Cita APA (7a ed.)

Klages, K. H. W. (1947). Ecological Crop Geography. The Macmillan Company.

Cita Chicago Style (17a ed.)

Klages, Karl H. W. Ecological Crop Geography. New York: The Macmillan Company, 1947.

Cita MLA (9a ed.)

Klages, Karl H. W. Ecological Crop Geography. The Macmillan Company, 1947.