Style de citation APA (7e éd.)

Semple, E. C., & Ratzel, F. (1911). Influences of geographic environment, on the basis of Ratzel's system of anthropo-geography. H. Holt and Co..

Style de citation Chicago (17e éd.)

Semple, Ellen Churchill, et Friedrich Ratzel. Influences of Geographic Environment, on the Basis of Ratzel's System of Anthropo-geography. New York: H. Holt and Co., 1911.

Style de citation MLA (8e éd.)

Semple, Ellen Churchill, et Friedrich Ratzel. Influences of Geographic Environment, on the Basis of Ratzel's System of Anthropo-geography. H. Holt and Co., 1911.