APA (7th ed.) Citation

Semple, E. C., & Ratzel, F. (1968). Influences of geographic environment, on the basis of Ratzel's system of anthropo-geography. Russell & Russell.

Chicago Style (17th ed.) Citation

Semple, Ellen Churchill, and Friedrich Ratzel. Influences of Geographic Environment, on the Basis of Ratzel's System of Anthropo-geography. New York: Russell & Russell, 1968.

MLA (8th ed.) Citation

Semple, Ellen Churchill, and Friedrich Ratzel. Influences of Geographic Environment, on the Basis of Ratzel's System of Anthropo-geography. Russell & Russell, 1968.