Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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